Phaser is a free and fast 2D game framework for making HTML5 games
3D game engine/framework in C, with Luajit and Python bindings now
A web-based IDE for HTML5 game development. Powered by Phaser
JavaScript framework to build game engines, games, emulators and apps
Cerberus Content Management System
Cross platform SDK
A continuation of the popular Artemis ECS framework
Powerful html5 & javascript library for creating applications & games.