HTKDragAndDropCollectionViewLayout:UICollectionViewLayout subclass that works together with a custom UICollectionViewCell to provide drag and drop for a UICollectionView. Works just like UITableView drag and drop. What's unique about this approach is that it does not need to create a "ghost" or "dummy" cell to provide the drag and drop functionality.
predaddy:DDD/CQRS/EventSourcing framework with annotation driven message bus