Do you know some good (to learn from) iOS open source apps? [closed]

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Today I read abouts this on hacker news https://github.com/udibr/bitcoinApp which is an interesting app, and is a good resource to learn from.

Do you know about some other open source iOS apps from where I can enrich my iOS/objective-c开发者_StackOverflow knowledge?

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From a game programmer perspective (mine)...

You can check cocos2d engine.

Oolong Engine (for 3D OpenGL ES).

Also, Canabalt went open source.