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Also, for game developers, Cocos2D iphone is pretty good too. It's reasonably lightweight, fast, and completely free. Pair that up with Box2D or chipmunk, which it comes with, and you have a complete game engine at no cost, with a good amount of community support.

edit -- link: http://www.cocos2d-iphone.org/

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I played with Cocos2d and I liked it a lot. Do you know the differences between Cocos2d and the sparrow framework?

No, sorry. Cocos2d is the first I've tried using, as I only just started iOS dev.

edit: A quick peruse through some github samples from their framework, and it looks like their API is busier, but seems to be less mature. This is from five minutes of browsing so may not be completely accurate.

I use the Sparrow framework and find it to mimic the Flash's API more closely, and the API as a whole is less complex. The primary downside at this time is that the community is less active/developed, but the author is very helpful when it comes to answering questions.

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