I stumbled across this new FREE open source 2D game engine for the iPhone called Sparrow. It is still in an early stage, but definitely a promising start. One of the advantages (or disadvantages) is it is written in pure Objective-C. Look for a full review and possibly a simple game example soon.
Sparrow is a pure Objective C library targeted on making game development as easy and hassle-free as possible. Sparrow makes it possible to write fast OpenGL applications without having to touch OpenGL or pure C (but easily allowing to do so, for those who wish). It uses a tried and tested API that is easy to use and hard to misuse.
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