[nkassis]

Not claiming they have never done anything for the community but they have far more closed projects than open ones.

[rimantas]

It's complicate. I believe each and every of their closed project depends a lot on a number of open ones—just take a look at Settings->About->Legal on iPhone or take a look at http://www.apple.com/opensource/. On the other hand they do not contribute to all of OSS they use. But http://www.opensource.apple.com/ is still impressive.