Chipmunk2D is a 2-dimensional real-time rigid body physics engine written by Scott Lembcke that is designed to be portable, lightweight, fast, and easy to use.

It included several high-level subroutines in Objective-C, and floating-point optimizations for the ARM processor.

[3] Aside from Objective-C, there are official bindings for Ruby, and third party interfaces exist for Python,[4] Haskell,[5] OCaml,[6] and others.

[7] Chipmunk is endorsed by a number of game libraries, including Aerosol, Gosu,[8] and Cocos2d.

Chipmunk has been widely used on the iPhone, Mac/Windows/Linux, and other platforms, including Nintendo Wii and Sony PSP.