cocos2d for iPhone
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cocos2d for iPhone[1] is a framework for building 2D games, demos, and other
graphical/interactive applications. It is based on the cocos2d [2] (python)
design:
  it uses the same API and design, but instead of using python it uses objective-c.
 
 
Main features
    * Scene management (workflow)
    * Transitions between scenes
    * Sprites and Sprite Sheets
    * Effects: Lens, Ripple, Waves, Liquid, etc.
    * Actions (behaviours): 
        * Trasformation Actions: Move, Rotate, Scale, Jump, etc.
        * Composable actions: Sequence, Spawn, Repeat, Reverse
        * Ease Actions: Exp, Sin, Cubic, etc.
        * Misc actions: CallFunc, OrbitCamera
    * Basic menus and buttons
    * Integrated Chipmunk 2d physics engine
    * Particle system
    * Text rendering support
    * Texture Atlas support
    * Tile Map support
    * Parallax scrolling support
    * High Score server
    * Touch/Accelerometer support
    * Portrait and Landscape mode
    * Integrated Pause/Resume
    * Supports PowerVR Texture Compression (PVRTC) format
    * Language: objective-c
    * Open Source: Compatible with open and closed source projects
    * OpenGL ES 1.1 based 
 
Experimental features:
    * Motion Streak / Ribbon support
    * Sound Engine support
 
This library does not work with the toolchain, but it
should be easy to port it to it.
 
 
Build Requeriments
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Mac OS X 10.5.3, Xcode 3.1, iPhone OS 2.0, Beta 8 release or later
 
 
Runtime Requirements
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Mac OS X 10.5.3, iPhone OS 2.0, Beta 8 release or later
 
 
 
[1] http://code.google.com/p/cocos2d-iphone
[2] http://www.cocos2d.org