cocos2d is a framework for building 2D games, demos, and other graphical/interactive applications. It is built over pyglet. It provides some conventions and classes to help you structure a "scene based application".

A cocos2d application consists of several scenes, and a workflow connecting the different scenes. It provides you with a "director" (a singleton) which handles that workflow between scenes. Each scene is composed of an arbitrary number of layers; layers take care of drawing to the screen (using the pyglet and OpenGL APIs), handling events and in general contain all of the game/application logic.

Cocos simplifies the game development in these areas:

• Flow control: Manage the flow control between different scenes in an easy way
• Sprites: Fast and easy sprites
• Actions: Just tell sprites what you want them to do. Composable actions like move, rotate, scale and much more
• Effects: Effects like waves, twirl, lens and much more
• Tiled Maps: Support for rectangular and hexagonal tiled maps
• Collision: Basic pure python support for collisions
• Transitions: Move from scene to scene with style
• Menus: Built in classes to create menus
• Text Rendering: Label and HTMLLabel with action support
• Built-in Python Interpreter: For debugging purposes
• Access to OpenGL functionality

For more information, visit the cocos2d homepage