I collected some AS3 Physics Engine projects listed below.If you know others not in following list reply it please.
Box2DFlashAS3 is an open source port of Erin Catto’s powerful c++ physics library Box2D.
a free AS3 open source physics engine written by Seraf ( Jérôme Birembaut ) capable to handle positions in a 3D environment.use Sandy library for all the 3D mathematical computations (matrix, 3D vector, plane). The inner architecture of the engine is also inspired by Sandy’s one.
It is built with many open source kits that are emerging. It can use any of the 3 major flash 3d engines (pv3d, sandy, away3d)
a two-dimensional rigid body physics engine written in ActionScript 3.0.
It is meant as an architectural and mathematical reference for developers interested in physics simulation in the area of game development or otherwise. It trades efficiency for modularity and extensibility.
Here is the author’s blog.
APE (Actionscript Physics Engine) is a free AS3 open source 2D physics engine for use in Flash and Flex, released under the MIT License.
Motor Physics is an open source 2D physics engine under the zlib/libpng license.
Revive is an open source 2D physics engine.You can download the source code from here.
Flade (Flash Dynamics Engine) is an open source actionscript 2.0 library for simulating 2D physics using Verlet integration. It currently features rectangular, circular, & wheel primitives, spring & angular constraints, and surfaces composed of line segments, circles, & rectangles. It’s designed primarily for games with a goal of speed and ease of use, and is MTASC -strict compatible.
an Actionscript 3.0 physics engine built for game developers.
The fisix engine is a verlet based physics engine for flash written in Actionscript 3.0. This engine is aimed towards use in games and other relatively cpu intensive real-time applications.
a game and physics engine for Flash,core parts of the physics solver and collision system are based on the C physics engine Chipmunk.