DEPRECATED
This project is no longer maintaned. Please, consider using Impact, Phaser or even some combination like matter.js with PixiJS.
Monogatari 
JavaScript game engine
This project aims to facilitate game programming for browsers. Currently supports 2D games and it's composed by the libraries three.js, box2d.js and howler.js.
You can check a simple game project here or read the generated API documentation.
Latest build from master is available here.