Babylon.js
Babylon.js: a complete JavaScript framework for building 3D games with HTML 5 and WebGL
Rot.js
ROguelike Toolkit
Nipplejs
A virtual joystick for touch capable interfaces.
Panda.js
Panda.js HTML5 game engine
Cutjs
Lightweight, fast, interactable 2D HTML5 rendering engine for cross-platform game development.
Verlet JS
A simple Verlet physics engine written in javascript
Isometric
JSIso - An HTML5 Canvas Tile Engine
Gamejs
GameJs is a thin library on top of the HTML canvas element. In addition to the drawing functions it has a set of generally helpful modules for game development.
Kiwi.js
Kiwi.js is a blazingly fast mobile & desktop browser based HTML5 game framework. It uses CocoonJS for publishing to the AppStore.
Joy.js
A Joyful 2D HTML5 Game Engine.
Blend4 Web
Blend4Web is a tool for interactive 3D visualization on the Internet
Black
World's fastest HTML5 2D game engine 🛸
Phina.js
phina.js is game library
Enchant.js
A simple JavaScript framework for creating games and apps
Flash JS
JavaScript graphics and games engine with API familiar to Flash one. Just look to examples sources.
Canvas Engine
Framework for HTML5 Canvas oriented 2D video games
Superpowers Core
:octopus: Superpowers — Extensible HTML5 app for real-time collaborative projects