2D physics library Box2D 2.3 for usage in Python.
After installing please be sure to try out the testbed demos.
They require either pygame or pyglet and are available on the
pybox2d homepage: http://pybox2d.googlecode.com
Box2D homepage: http://www.box2d.org
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.