APE (Actionscript Physics Engine) :APE 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.
Demo Source:http://ape.googlecode.com/svn/
WOW-Engine 3D Physics Engine:WOW-Engine 是又一个 开源的 AS3 3D Physics Engine
Demo
WOW-Engine ver1 Classes
IMPORTANT!!! wow-engine ver1 need AS3 Data Structures For Game Developers for run
Away3D :Away3D is a realtime 3D engine for Flash
Demo Source
Sandy :Sandy is an intuitive and user-friendly 3D open-source library developed in Actionscript 2.0 and now Actionscript 3.0 for Adobe Flash.
Demo1 Demo2
官方下载
source:On the google code SVN : http://sandy.googlecode.com/svn/trunk/sandy/as3/branches/3.0.2/
Flade :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.
Demo source