Download the Framework & Demo Files From Github
Box2D Flash Alchemy Port is an AS3 interface to the Box2D C++ 2D physics engine compiled with Adobe Alchemy. Documentation located on the GitHub wiki page.
World Construction Kit is is a toolset / framework for rapidly developing physics based games / websites within the Flash IDE. WCK allows you to layout your 2d worlds / game levels entirely within Flash and have them hook into the physics simulation without writing any code. Documentation located on the GitHub wiki page.
Read the core Box2D C++ documentation
Read the Alchemy port / WCK documentation on GitHub
Visit the Box2D Flash / WCK forums
Play Sideroller, a game built with WCK.