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awesome-substrate

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A curated list of awesome projects and resources related to the Substrate blockchain development framework.

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# Awesome Substrate [![Awesome](https://awesome.re/badge-flat.svg)](https://awesome.re)

> Please see [`awesome-dot`](https://github.com/haquefardeen/awesome-dot) for a similar list that is more general to the entire Polkadot ecosystem, not just Substrate.

---

> An awesome list is a list of awesome things curated by the Substrate community.

Substrate is a framework for building upgradable, modular and efficient
blockchains. Substrate is an open-source library of [Rust](https://www.rust-lang.org/) code that is
maintained by [Parity Technologies](https://www.parity.io/). Source code available on
[GitHub](https://github.com/paritytech/substrate).

## Contents

- [Resources](#resources)
- [Support](#support)
- [Social](#social)
- [Events](#events)
- [Blogs](#blogs)
- [Videos](#videos)
- [Templates](#templates)
- [FRAME Pallets](#frame-pallets)
- [Framework Extensions](#framework-extensions)
- [Client Libraries](#client-libraries)
- [Mobile](#mobile)
- [Tools](#tools)
- [Products and Services](#products-and-services)
- [Alternative Implementations](#alternative-implementations)
- [SCALE Codec](#scale-codec)

## Resources

- [DotJobs](https://dotjobs.net/) - A job board for the Substrate and Polkadot ecosystem projects, maintained by [Stateless.Money](https://stateless.money/).
- [Developer Hub GitHub](https://github.com/substrate-developer-hub/) - Substrate Developer Hub repositories.
- [Ecosystem Projects](https://substrate.io/ecosystem/projects/) - Projects and teams building with Substrate.
- [Polkadot Stack](https://github.com/w3f/Grants-Program/blob/master/docs/polkadot_stack.md) - An `awesome list` maintained by our friends at [Web3 Foundation](https://web3.foundation/).
- [Official Homepage](https://substrate.io/) - Vision, ecosystem, opportunities, and much more.
  - [Docs](https://docs.substrate.io/) - Developer documentation.
  - [Tutorials](https://docs.substrate.io/tutorials) - Guided exercises to get you started.
  - [How-to guides](https://docs.substrate.io/how-to-guides) - Workflows outlined to achieve a specific goal.
  - [Reference Docs](https://docs.substrate.io/rustdocs) - Versioned API documentation.
- Technical Papers
  - [Polkadot Lightpaper](https://polkadot.network/Polkadot-lightpaper.pdf)
  - [Polkadot: Vision for a heterogeneous multi-chain framework](https://github.com/polkadot-io/polkadotpaper/raw/master/PolkaDotPaper.pdf)
  - [Overview of Polkadot and its Design Considerations](https://arxiv.org/abs/2005.13456.pdf)
    - [Chinese Translation](https://github.com/AmadeusGB/Overview-of-Polkadot) (by community)

## Support

- [Builders Program](https://substrate.io/ecosystem/substrate-builders-program/) - White-glove solutions and dedicated support team for visionary teams using Substrate.
- [Stack Exchange](https://substrate.stackexchange.com/) - The best place for all technical questions.
- [Web3 Foundation Grants](https://web3.foundation/grants) - Funding for ecosystem development.
- [Polkadot Treasury](https://wiki.polkadot.network/docs/learn-treasury#creating-a-treasury-proposal) - The Treasury funds are allocated through the voting on spending proposal.

## Social

- [Substrate Developers Chat (Telegram)](https://t.me/substratedevs) - Chat with other Substrate developers, also bridged to [matrix](https://matrix.to/#/#substratedevs:matrix.org).
- [Twitter](https://twitter.com/substrate_io) - Follow us to stay up-to-date.
- [Polkaverse](https://polkaverse.com) - A decentralized news-feed style social platform for the Polkadot community to discuss, share knowledge, post ecosystem updates and interact with posts. Built on top of [Subsocial](https://subsocial.network).

## Events

- [Sub0 Developer Conference](https://sub0.parity.io/) - Semiannual, online and in-person for all
  things Substrate.
- [Substrate Seminar](https://substrate.io/ecosystem/resources/seminar/) - Bi-weekly
  collaborative learning sessions.

## Blogs

- [DotLeap](https://dotleap.com/) - Polkadot and Substrate Community blog and newsletter.
- [Official](https://www.parity.io/blog/tag/parity-substrate) - Published by Parity.

## Videos

- [Parity YouTube](https://www.youtube.com/c/paritytech)
  - [Substrate Seminar (YouTube Archive)](https://www.youtube.com/playlist?list=PLp0_ueXY_enXRfoaW7sTudeQH10yDvFOS)
  - [Sub0 Conference Nov. 2022](https://youtube.com/playlist?list=PLOyWqupZ-WGvywLqJDsMIYdCn8QEa2ShQ)
  - [Sub0 Conference Oct. 2020](https://www.youtube.com/playlist?list=PLp0_ueXY_enUZk1RuEAU9ly5h0wy5FuLs)
  - [Sub0 Conference Dec. 2019](https://www.youtube.com/playlist?list=PLp0_ueXY_enWZ4UZE7rM0hdT8Z_ZTjU5V)
  - [Sub0 Conference Apr. 2019](https://www.youtube.com/playlist?list=PLp0_ueXY_enWqrfP_vR4PLhzQj76fLT8y)
- [Polkadot Network Technical Explainers](https://www.youtube.com/playlist?list=PLOyWqupZ-WGuAuS00rK-pebTMAOxW41W8)
- [Substrate Seminar Twitch](https://www.twitch.tv/polkadotdev) - Biweekly stream hosted by Polkadot Developers Twitch.
  - [Old Seminar Crowdcast](https://www.crowdcast.io/e/substrate-seminar-2/) - Seminar archive.
  - [Older Seminar Crowdcast](https://www.crowdcast.io/e/substrate-seminar/) - Older still Seminar archive.
- [Substrate: A Rustic Vision for Polkadot by Gavin Wood at Web3 Summit 2018](https://www.youtube.com/watch?v=0IoUZdDi5Is)

## Templates

- [Base](https://github.com/substrate-developer-hub/substrate-node-template) - Minimal FRAME-based
  node, derived from [upstream](https://github.com/paritytech/substrate/tree/master/bin/node-template).
- [Frontier](https://github.com/paritytech/frontier/tree/master/template) - Fronter enabled EVM and Ethereum RPC compatible Substrate node, ready for hacking.
- [Front-End](https://github.com/substrate-developer-hub/substrate-front-end-template) - Polkadot-JS API and [React](https://reactjs.org/) app to build front-ends for Substrate-based chains.
- [Parachain](https://github.com/substrate-developer-hub/substrate-parachain-template) - Cumulus enabled Substrate node, derived from [upstream](https://github.com/paritytech/cumulus/tree/master/parachain-template).
- [`substrate-stencil`](https://github.com/kaichaosun/substrate-stencil) - A template for a Substrate node that includes staking and governance capabilities.
- [polkadot-js-api-ts-template](https://github.com/kianenigma/polkadot-js-api-ts-template) - A template project to kickstart hacking on top of `@polkadot/api`.
- [INK!athon](https://inkathon.xyz/) - Full-stack dApp boilerplate with ink! smart contracts and a React frontend using the `useInkathon` (listed below) hooks library maintained by [Scio Labs](https://scio.xyz).
- [Subsocial Starter Kit](https://docs.subsocial.network/docs/develop/developer-quickstart) - A starter-kit for building web3 social apps for the Polkadot ecosystem, powered by the [Subsocial blockchain](https://subsocial.network).

## FRAME Pallets

- [Chainlink Feed Pallet](https://github.com/smartcontractkit/chainlink-polkadot) - Chainlink feed token interface.
- [Official in Substrate](https://github.com/paritytech/substrate/tree/master/frame) - Large collection, Parity maintained.
- [Open Runtime Module Library (ORML)](https://github.com/open-web3-stack/open-runtime-module-library) - Community maintained collection of Substrate runtime modules.
- [Sunshine Bounty](https://github.com/sunshine-protocol/sunshine-bounty/tree/master/pallets) - Distributed autonomous organization (DAO) for administering a bounty program.
- [Sunshine Identity](https://github.com/sunshine-protocol/sunshine-keybase/tree/master/identity/pallet) - Keybase-inspired identity management.
- [Sunshine Faucet](https://github.com/sunshine-protocol/sunshine-keybase/tree/master/faucet/pallet) - Dispense resources for a development chain.
- [RMRK Pallets](https://github.com/rmrk-team/rmrk-substrate) - Nested, conditional & Multi-resourced NFTs.

## Framework Extensions

- [Bridges](https://github.com/paritytech/parity-bridges-common) - A collection of tools for cross-chain communication.
- [Cumulus](https://github.com/paritytech/cumulus) - A set of tools for writing Substrate-based Polkadot parachains.
- [FRAME](https://docs.substrate.io/v3/runtime/frame/) - A system for building Substrate runtimes.
- [Frontier](https://github.com/paritytech/frontier) - End-to-end Ethereum emulation for Substrate chains.
- [ink!](https://github.com/paritytech/ink) - Rust smart contract language for Substrate chains.
- [IntegriTEE](https://book.integritee.network/) - Trusted off-chain execution framework that uses [Intel SGX](https://en.wikipedia.org/wiki/Software_Guard_Extensions) trusted execution environments.
- [Polkadot-JS](https://polkadot.js.org/) - Rich JavaScript API framework for front-end development.

## Client Libraries

- [.Net API](https://github.com/usetech-llc/polkadot_api_dotnet) - Maintained by [Usetech](https://usetech.com/blockchain/).
- [.NET Substrate API](https://github.com/ajuna-network/Ajuna.NetApi) - Used in [nuget](https://www.nuget.org/packages/Ajuna.NetApi/), and [Unity Example](https://github.com/ajuna-network/SubstrateNET/tree/master/SubstrateNET.UnityDemo); Maintained by [Ajuna Network](https://ajuna.io/).
- [.NET Toolchain/SDK](https://github.com/ajuna-network/Ajuna.SDK) - Toolchain for Substrate .NET. Pre-generated [SubstrateNET](https://github.com/ajuna-network/SubstrateNET); Maintained by Ajuna Network.
- [`go-substrate-gen`](https://github.com/Aphoh/go-substrate-gen) - Generate Go (de)serialization/client code from Substrate metadata.
- [`sube`](https://github.com/virto-network/sube) - Lightweight Rust client library and CLI with support for type information.
- [`subxt`](https://github.com/paritytech/substrate-subxt) - Official Rust client.
- [C++ API](https://github.com/usetech-llc/polkadot_api_cpp) - Maintained by Usetech.
- [Go RPC Client](https://github.com/centrifuge/go-substrate-rpc-client/) - Maintained by [Centrifuge](https://centrifuge.io/).
- [Kotlin Client](https://github.com/NodleCode/substrate-client-kotlin) - Maintained by [Nodle.io](https://github.com/NodleCode).
- [Polkadot-JS API](https://github.com/polkadot-js/api/) - Semi-official JavaScript library for Substrate-based chains.
- [Python Interface](https://github.com/polkascan/py-substrate-interface) - Maintained by [Polkascan Foundation](https://polkascan.org/).
- [Rust API Client](https://github.com/scs/substrate-api-client) - Rust client maintained by [Supercomputers Systems AG](https://www.scs.ch/).
- [Subscan Go Utilities](https://github.com/itering/subscan-essentials) - SS58 and more, developed by Subscan.
- [Sub-Api](https://github.com/kodadot/packages/tree/main/sub-api) - Friendly wrapper for Polkadot.js API maintained by KodaDot.
- [`useInkathon`](https://github.com/scio-labs/use-inkathon) - Typesafe React Hooks library abstracting functionality by polkadot.js for working with Substrate-based networks and ink! smart contracts maintained by Scio Labs.
- [Subsocial JS SDK](https://github.com/dappforce/subsocial-js) - A JS SDK for developers to build web3 social apps on top of Subsocial.

## Mobile

- [Fearless Utils Android](https://github.com/soramitsu/fearless-utils-Android) - Android Substrate tools.
- [Fearless Utils iOS](https://github.com/soramitsu/fearless-utils-iOS) - iOS Substrate tools.
- [Nova Substrate SDK Android](https://github.com/nova-wallet/substrate-sdk-android) - Substrate SDK and tools for Android.
- [Nova Substrate SDK iOS](https://github.com/nova-wallet/substrate-sdk-ios) - Substrate SDK and tools for iOS.
- [Polkadot-Dart](https://github.com/Pocket4D/Polkadot-Dart) - Dart Substrate API.
- [PolkaWallet SDK](https://github.com/polkawallet-io/sdk) - Flutter SDK for Substrate-based App.
- [React-Native-Substrate-Sign](https://github.com/paritytech/react-native-substrate-sign) - Rust library for React Native.

## Tools

- [`offline-election`](https://github.com/paritytech/substrate-debug-kit/tree/master/offline-election) - Tool to predict nominated proof-of-stake elections.
- [`offchain::ipfs`](https://rs-ipfs.github.io/offchain-ipfs-manual/) - Substrate infused with [IPFS](https://ipfs.io/).
- [`polkadot-js-bundle`](https://github.com/shawntabrizi/polkadot-js-bundle) - A standalone JS bundle that contains Polkadot{JS} libraries.
- [`polkadot-launch`](https://github.com/shawntabrizi/polkadot-launch) - Simple CLI tool to launch a local Polkadot test network.
- [`polkadot-runtime-prom-exporter`](https://github.com/paritytech/polkadot-runtime-prom-exporter/) - A [Prometheus](https://prometheus.io/) exporter for Polkadot runtime metrics (modifiable for Substrate use).
- [`polkadot-scripts`](https://github.com/paritytech/polkadot-scripts) - A collection of scripts Parity uses to diagnose Polkadot/Kusama.
- [`polkadot-starship`](https://github.com/koute/polkadot-starship) - Another tool to launch a local Polkadot test network, with emphasis on the ability to run big testnets.
- [`srtool-actions`](https://github.com/chevdor/srtool-actions) - GitHub actions to easily use the `srtool` Docker image to build your own runtime.
- [`srtool-cli`](https://github.com/chevdor/srtool-cli) - CLI frontend for the `srtool` Docker image.
- [`srtool`](https://github.com/paritytech/srtool) - Docker image to deterministically build a runtime.
- [`subsee`](https://github.com/ascjones/subsee) - CLI to inspect metadata of a Substrate node as JSON.
- [`subalfred`](https://github.com/hack-ink/subalfred) - An all-in-one Substrate development toolbox.
- [`substrate-balance-calculator`](https://github.com/shawntabrizi/substrate-balance-calculator) - Breakdown the balances of your Substrate account.
- [`substrate-balance-graph`](https://github.com/shawntabrizi/substrate-balance-graph) - Create a graph of the token balance over time of a Substrate address.
- [`substrate-graph-benchmarks`](https://github.com/shawntabrizi/substrate-graph-benchmarks) - Graph the benchmark output of FRAME pallets.
- [`substrate-js-utils`](https://github.com/shawntabrizi/substrate-js-utilities) - A set of useful JavaScript utilities for Substrate that uses the Polkadot{JS} API; Also [deployed as a website](https://www.shawntabrizi.com/substrate-js-utilities/).
- [`substrate-society`](https://github.com/shawntabrizi/substrate-society) - A basic front-end for the FRAME Society pallet.
- [`substrate-toml-lint`](https://github.com/shawntabrizi/substrate-toml-lint) - A toml parser and checker to avoid common errors in Substrate projects.
- [`subwasm`](https://github.com/chevdor/subwasm) - CLI to inspect a runtime WASM blob offline. It shows information, metadata and can compare runtimes. It can also help you fetch a runtime directly from a node.
- [`sup`](https://github.com/clearloop/sup) - Command line tool for generating or upgrading a Substrate node.
- [`scale-value`](https://github.com/paritytech/scale-value) - Analogous to `serde_json` but for SCALE; Library to decode arbitrary SCALE encoded bytes into a dynamic `Value` given type info from `scale-info`.
- [`scale-decode`](https://github.com/paritytech/scale-decode) - Decode SCALE bytes into arbitrary custom types by implementing a visitor trait.
- [Aleph.im](https://aleph.im) - Scalable, decentralized database, file storage, and computation services for Substrate chains and more.
- [Archive](https://github.com/paritytech/substrate-archive) - Indexing engine for Substrate chains.
- [Dev Hub Utils](https://github.com/danforbes/substrate-devhub-utils) - _Unofficial_ utilities for working with official Substrate Developer Hub resources.
- [Europa](https://github.com/patractlabs/europa) - A sandbox for the Substrate runtime execution environment.
- [Fork Off Substrate](https://github.com/maxsam4/fork-off-substrate) - Script to help bootstrap a new chain with the state of a running chain.
- [fudge](https://github.com/centrifuge/fudge) - Core lib for accessing and (arbitrarily) manipulating substrate databases, including the building and importing of local blocks.
- [Gantree Library](https://github.com/gantree-io/gantree-lib-nodejs) - A suite of technologies for managing Substrate-powered parachain networks via rapid spin-up & tear-down.
- [Halva](https://github.com/halva-suite/halva) - A toolchain for improving the experience of developing on Substrate.
- [Hydra](https://github.com/Joystream/hydra) - A GraphQL framework for Substrate nodes.
- [Jupiter](https://github.com/patractlabs/jupiter) - Testnet for smart contracts written for the FRAME Contracts pallet and ink!.
- [Megaclite](https://github.com/patractlabs/megaclite) - Zero-knowledge tools for the Polkadot ecosystem.
- [Metadata Portal](https://nova-wallet.github.io/metadata-portal/) - A self-hosted webpage that shows the latest metadata and chain specs for any given network.
- [Minimark](https://github.com/kodadot/packages) - Implementation of RMRK NFT v1/v2 protocol maintained by KodaDot.
- [Nova Polkadot Utils](https://github.com/nova-wallet/nova-utils) - Contains static info & metadata to support client apps in Polkadot ecosystem to map it to various netowrks.
- [Polkadot Vault](https://signer.parity.io/) (formerly Parity Signer) - Upcycle an unused mobile phone into an air-gapped hardware wallet.
- [Polkadot PANIC](https://github.com/SimplyVC/panic_polkadot) - Monitoring and alerting solution for Polkadot nodes by Simply VC, compatible with many Substrate chains.
- [Polkadot Tool Index](https://wiki.polkadot.network/docs/build-tools-index) - List of tools available for your development with Polkadot and any Substrate chain including Block Explorers, Wallets, Network Monitoring & Reporting, Clients, Benchmarking, Fuzzing, Forking, SCALE Codec, CLI Tools and much more.
- [Polkadot-JS Apps UI](https://polkadot.js.org/apps/) - Semi-official block explorer & front-end for Substrate-based chains.
- [Polkadot-JS Extension](https://github.com/polkadot-js/extension) - Browser extension for interacting with Substrate-based chains.
- [Polkascan](https://polkascan.io/) - Multi-chain block explorer maintained by Polkascan Foundation.
- [Proxy Hot Wallet Demo](https://github.com/emostov/proxy-hot-wallet) - A demonstration of a secure, convenient, and flexible hot wallet architecture built on Substrate primitives.
- [Redspot](https://github.com/patractlabs/redspot) - A [Truffle](https://www.trufflesuite.com/truffle)-like toolkit for smart contracts for the FRAME Contracts pallet and ink!.
- [Sidecar](https://github.com/paritytech/substrate-api-sidecar) - REST service that runs alongside Substrate nodes.
- [SS58 Transform](https://polkadot.subscan.io/tools/ss58_transform) - Display key's addressees with all SS58 prefixes.
- [Staking Rewards Collector](https://github.com/w3f/staking-rewards-collector) - A script to parse and output staking rewards for a given Kusama or Polkadot address and cross-reference them with daily price data.
- [Subkey](https://docs.substrate.io/reference/command-line-tools/subkey/) - Command line utility for working with cryptographic keys.
- [SubQuery](https://subquery.network) - A GraphQL indexer and query service that allows users to easily create indexed data sources and host them online for free.
  - [Nova SubQuery API](https://github.com/nova-wallet/subquery-nova) - A SubQuery API implementation for operation history and staking analytics.
- [Subscan](https://www.subscan.io/) - Multi-network explorer for Substrate-based chains.
- [Subsquid](https://subsquid.io) - An indexing framework (SDK + infrastructure) to quickly and easily turn Substrate and EVM on-chain data into APIs and host them.
- [Substate](https://github.com/arrudagates/substate) - 100% no-std/wasm compatible Substrate storage key generator library for Rust.
- [Substrate debug-kit](https://github.com/paritytech/substrate-debug-kit) - A collection of tools and libraries for debugging Substrate-based chains.
- [Substrate Docker Builders](https://github.com/ETeissonniere/substrate-nodeops) - A set of Dockerfiles and GitHub Actions to auto-build and push a Docker image for Substrate-based chains.
- [Substrate Faucet Bot](https://github.com/starkleytech/substrate-faucet) - Python-based faucet for development purposes.
- [Substrate Graph](https://github.com/playzero/substrate-graph) - GraphQL indexer for Substrate-based chains.
- [Typechain-Polkadot](https://github.com/Supercolony-net/typechain-polkadot) - Hepls users to generate typescript types from contract ABIs (ink!) and generate runtime code to interact with contracts and deploy them.
- [TxWrapper](https://github.com/paritytech/txwrapper) - Helpful library for offline transaction creation.
- [VSCode Substrate](https://marketplace.visualstudio.com/items?itemName=paritytech.vscode-substrate) - Plugin for Visual Studio Code.
- [Polkaholic.io](https://polkaholic.io) - Multi-chain block explorer with API and DeFi support across 40+ parachains.
- [SubID](https://github.com/dappforce/subid) - An advanced cross-chain portfolio management tool for the Polkadot ecosystem, allowing any user to see their balances across chains; view their crowdloan history; view their NFTs across Polkadot ecosystem chains; claim their vested tokens and perform cross-chain transfers.
- [Subsocial SDK Playground](https://play.subsocial.network) - Subsocial JS SDK Playground allows you to fetch spaces, send transactions on blockchain and test the SDK code snippets on the go without the need to download or setup anything locally.
- [Uptest Runtime upgrade tool](https://github.com/uptest-sc/uptest) - Uptest command line client and libuptest Rust library are two tools used for debugging storage changes and runtime upgrades.

## Products and Services

- [OnFinality](https://onfinality.io) - Free and paid services to shared Substrate based nodes.
- [PrivHost](https://privhost.laissez-faire.trade/) - Public Tor .onion supported nodes for Polkadot, Kusama and Edgeware.
- [Substrate Devops Guide](https://paritytech.github.io/devops-guide/) - Parity devops team's configuration and guidance on deploying, monitoring, and maintaining node infrastructure.

## Alternative Implementations

- [Gossamer](https://github.com/ChainSafe/gossamer) - A Polkadot client implemented in Go; from [ChainSafe](https://chainsafe.io/).
- [Kagome](https://kagome.readthedocs.io/en/latest/) - A C++17 implementation of the Polkadot client; from [Soramitsu](http://www.soramitsu.co.jp/).
- [LimeChain AssemblyScript Runtime](https://github.com/LimeChain/as-substrate-runtime) - An account-based Substrate proof-of-concept runtime written in AssemblyScript; from [LimeChain](https://limechain.tech/).

## SCALE Codec

- [AssemblyScript](https://github.com/LimeChain/as-scale-codec) - Maintained by LimeChain.
- [C](https://github.com/MatthewDarnell/cScale) - Maintained by Matthew Darnell.
- [C++](https://github.com/soramitsu/scale-codec-cpp) - Maintained by Soramitsu.
- [Codec Definition](https://docs.substrate.io/v3/advanced/scale-codec/) - Official codec documentation.
- [Go](https://github.com/itering/scale.go) - Maintained by [Itering](https://www.itering.com/).
- [Haskell](https://github.com/airalab/hs-web3/tree/master/src/Codec) - Maintained by [Robonomics Network](https://robonomics.network/).
- [Java](https://github.com/emeraldpay/polkaj/tree/master/polkaj-scale) - Maintained by [Emerald](https://emerald.cash/).
- [Parity SCALE Codec](https://github.com/paritytech/parity-scale-codec) - Reference implementation written in Rust.
- [Python](https://github.com/polkascan/py-scale-codec) - Maintained by Polkascan Foundation.
- [Ruby](https://github.com/itering/scale.rb) - Maintained by Itering.
- [Scales](https://github.com/virto-network/scales) - Serializing SCALE using type information from a type registry.
- JavaScript / TypeScript implementations:
  - [polkadot-js/api](https://github.com/polkadot-js/api/tree/master/packages/types) - Maintained by Polkadot-JS.
  - [scale-ts](https://github.com/unstoppablejs/unstoppablejs/tree/main/packages/scale-ts#scale-ts) - Maintained by Josep M Sobrepere.
  - [soramitsu/scale-codec-js-library](https://github.com/soramitsu/scale-codec-js-library) - Maintained by Soramitsu.

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