ActionScriptの物理計算エンジン

Box2d: http://box2dflash.sourceforge.net/
APE: http://www.cove.org/ape/
FOAM: http://code.google.com/p/foam-as3/
Fisix: http://www.fisixengine.com/
WOW: http://seraf.mediabox.fr/wow-engine/as3-3d-physics-engine-wow-engine/