New submitter JoeKilner writes "The Turbulenz HTML5 games engine has been released as open source under the MIT license. The engine is a full 3D engine written in TypeScript and using WebGL. To see what the engine is capable off, check out this video of a full 3D FPS running in the browser using the Turbulenz engine and Quake 4 assets. You can see some of the games already developed with the engine at Turbulenz.com. (Note — to try the games without registering, hit the big blue 'Play as Guest' button.) Also, IE doesn't have WebGL support yet, so to play without a plugin try Chrome or FIrefox."