ChuClone is a 2.5D HTML5 game that uses 2D physics (Box2D), but is drawn in 3D (Three.js).
It contains a from scratch custom Box2D WorldEditor that can create/destroy/clone/drag/scale objects the world in realtime allowing easy level design iteration. The editor supports panning, and zooming, levels are saved via HTML5 localstorage or to the database via rails web-application which is also open source ( https://github.com/onedayitwillmake/ChuCloneSite ).
It also supports an arcade cabinate mode using Node.JS and html5-websocket connection to control the character remotely (https://github.com/onedayitwillmake/NoBarrierOSC/tree/joystick)
Arcade Cabinate Mode - https://github.com/onedayitwillmake/NoBarrierOSC/tree/joystick
Creative Commons Attribution-NonCommercial-ShareAlike http://creativecommons.org/licenses/by-nc-sa/3.0/