This is a pretty interesting question: Microsoft has CodePlex, but has also been using GitHub quite a bit lately. Will Apple put Swift as part of http://www.opensource.apple.com/, or start using GitHub? https://github.com/apple seems to be squatted...

How can you tell that's a squatter and not Apple?

Sorry, I didn't mean to make that distinction, I just mean that _someone_ has control over this username.

On Github, surely, where they are already hosting ResearchKit.

LLVM has a GitHub mirror, too.

https://github.com/llvm-mirror/llvm