Swift is now open source!
We are excited by this new chapter in the story of Swift. After Apple unveiled the Swift programming language, it quickly became one of the fastest growing languages in history. Swift makes it easy to write software that is incredibly fast and safe by design. Now that Swift is open source, you can help make the best general purpose programming language available everywhere.
Welcome to Swift.org – Swift.org
*1 : Chris Lattner氏はSwiftをAppleのプロジェクトとして2010年07月から限られた数人の開発者だけで始めたと自身のサイトで語っているため。（maclalala2様が翻訳してくれているので、興味のある方はこちらをどうぞ）
Today is the result of an amazing amount of work by dedicated and phenomenal teams of people across Apple. Proud to be part of the team!
I started work on the Swift Programming Language (wikipedia) in July of 2010. I implemented much of the basic language structure, with only a few people knowing of its existence. A few other (amazing) people started contributing in earnest late in 2011, and it became a major focus for the Apple Developer Tools group in July 2013.