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Re:Ask HN:Any idea on list of open source software used in A... by adamrmcd on Sunday February 19, 2012 @03:23AM (#3608943)
Way back in 1998 Apple contributed several patches to KHTML (KDE's browser). I think in 2001 Apple forked KHTML to become WebKit. WebKit is LGPLv2.1[1] and Apple dedicates the second-most[2] number of developers to its development, second only to Google.

[1] http://en.wikipedia.org/wiki/Webkit#Open-sourcing

[2] http://trac.webkit.org/wiki/WebKit%20Team

Re:Ask HN:Any idea on list of open source software used in A... by rbnio on Sunday February 19, 2012 @05:28PM (#3610622)
Re:Ask HN:Any idea on list of open source software used in A... by turingbook on Sunday February 19, 2012 @05:51AM (#3609112)
LLVM is another important open source project from Apple. http://en.wikipedia.org/wiki/Low_Level_Virtual_Machine

And they also developed an open standard: OpenCL.