As I previously highlighted after the WWDC Apple have announced that Swift is now open source.

More details are on the Swift blog

Swift is now open source. Today Apple launched the open source Swift community, as well as amazing new tools and resources including: Swift.org – a site dedicated to the open source Swift community Public source code repositories at github.com/apple A new Swift package manager project for easily sharing and building code A Swift-native core libraries project with higher-level functionality above the standard library Platform support for all Apple platforms as well as Linux

Swift.org is an entirely new site dedicated to open source Swift. This site hosts resources for the community of developers that want to help evolve Swift, contribute fixes, and most importantly, interact with each other. It also provides development snapshots for Apple and Linux platforms, requires OS X 10.11 (El Capitan) or Ubuntu 14.04 or 15.10 (64-bit).

Source code is available on Github