At the Game Developer Conference (GDC) in March, Mozilla and Unreal announced that they'd ported Unreal Engine 3 to JavaScript and WebGL in just four days.

Unreal Engine 3, the game engine that runs fan favorites like Mass Effect, Gears of War, and Infinity Blade, has been ported to run inside a web browser without any plug-ins. Using JavaScript ...

Cocos has had great success with PC and mobile games with its 2D game engine. Now it is adding 3D to its open-source Cocos Creator 3.0.