Open source HTML5 game frameworks

Phaser

Phaser is a fun, free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering. (MIT)

Cross-platform

Superpowers

Superpowers is an HTML5 development environment for making 2D and 3D games. It can be extended with plugins and lets you collaborate in real-time. 2D+3D game making for indies. Free and open source, finally! (GPL)

Cross-platform

2 applications