cocos2d for iPhone engine

cocos2d for iPhone is a engine framework for building 2D games, demos, and other graphical/interactive applications. It is based on the cocos2d design: it uses the same concepts, but instead of using python it uses objective-c.

cocos2d for iPhone is:

• Easy to use: it uses a familiar API, and comes with lots of examples
• Fast: it uses the OpenGL ES best practices and optimized data structures
• Flexible: it is easy to extend, easy to integrate with 3rd party libraries
• Free: is open source, compatible both with closed and open source games
• Community supported: cocos2d has an active, big and friendly community (forum, IRC)
• AppStore approved: More than 2500 AppStore games already use it, including many best seller games.

cocos2d for iPhone supports: iPod Touch, iPhone, iPad and OS X 

Features:

• Scene management (workflow)
• Transitions between scenes
• Sprites and Sprite Sheets
• Effects: Lens, Ripple, Waves, Liquid, Twirl, etc.
• Actions (behaviors):
  • 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 physics engine (both Box2d and Chipmunk)
• Particle system
• Text rendering support (variable and fixed width fonts)
• Texture Atlas support
• Tile Map support (TMXmaps):
  • Orthogonal maps
  • Isometric maps
  • Hexagonal maps
• Parallax scrolling support
• Sound support
• Streak Motion support
• Render Texture support
• High Score server (Cocos Live)
• Point based API: Supports Retina Display
• Touch/Accelerometer support (iOS).  Keyboard / Mouse support (Mac)
• Portrait and Landscape mode (iOS) / Automatic Fullscreen support (Mac)
• Integrated Pause/Resume
• Fast Textures:Supports PVRTC textures, 8-bit textures, 16-bit textures and 32-bit textures
• Language: objective-c
• OpenGL ES 1.1 based (iOS) / OpenGL 1.5 based (Mac)