Would you like to create a game similar to Angry Birds in Javascript? box2dweb can probably help you with that. box2dweb is a port of Box2DFlash 2.1a to JavaScript. The Box2D physics engine was developed by Erin Catto.

There already exists a port to JavaScript called Box2dJs, but it’s not up-to-date and you have to import a big amount of JavaScript files in every project, whereas this version is stored in a single file.

Requirements: Javascript Framework
Demo: http://code.google.com/p/box2dweb/
License: License Free