http://www.opensource.apple.com/
Can't argue Apple's contributions rise to the level of Bell Labs (that's the gold standard of research groups). But WebKit, for example, certainly has been leveraged to great effect outside of Apple.
http://www.opensource.apple.com/
Can't argue Apple's contributions rise to the level of Bell Labs (that's the gold standard of research groups). But WebKit, for example, certainly has been leveraged to great effect outside of Apple.