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This is a simple and nice Physicsengine by Andre Michelle. Source codes are to download at the example pages.

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Glaze is a game and physics engine for Flash including:

- Rigid Body Dynamics
- Scene management
- Line of sight
- User Input
- Scrolling
- AI

It is based on the C physics engine Chipmunk.

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Motor 2 is another physics engine based on Box2D. Programmed by polygonal labs and looks very promissing.

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Box2D is another physics engine worth to try. It was ported from the C++ library Box2D.

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FOAM is another physics engine created by Drew Cummins. His objective when creating this engine was to bridge the gap of a well documented, well structured physics engine which comes with comprehensive resources and tutorials.

The engine comes with API documentation and examples. New examples and tutorials should appear on his homepage.

Besides of the engine home you can download the files from http://code.google.com/p/foam-as3/

The engine is AS3 only.

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APE (Actionscript Physics Engine) is a free AS3 open source 2D physics engine for use in Flash and Flex, released under the MIT License. APE is written and maintained by Alec Cove.