Firefox for iOS is coming soon to iOS. Done in Swift, targeted for iOS8 and iPhone only to begin with.
In-progress: A community-driven replacement for JSQMessagesViewController
Swift audio synthesis, processing, & analysis platform for iOS, macOS and tvOS
Swift command line tool that generates your Xcode project from a simple spec and your folder structure
Scrollable UINavigationBar that follows the scrolling of a UIScrollView
A tool to enforce Swift style and conventions.