Stencyl is a newly-released, free game creation tool that comes with a suite of drag n’ drop editors to simplify the development and publishing of Flash games. There’s a big emphasis on collaboration – StencylForge and StencylTalk let you easily share resources and chat with other developers while you work on your project. For designers who are not so fond of drag n’ drop interfaces, there is a “code mode” for Stencyl’s game logic editor that can be used in conjunction with its simplified “design mode”.
The engine is based on Adam Saltsman’s Flixel library and it uses Box2d for physics. The logic editor is based off of the educational programming language Scratch.