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
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.
Verlet JS
A simple Verlet physics engine written in javascript
Joy.js
A Joyful 2D HTML5 Game Engine.
Isometric
JSIso - An HTML5 Canvas Tile Engine
Cutjs
Lightweight, fast, interactable 2D HTML5 rendering engine for cross-platform game development.
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
Tmlib.js
JavaScript をより使いやすく, より便利に, そしてより豊かに.
Enchant.js
A simple JavaScript framework for creating games and apps
Coquette
A micro framework for JavaScript games
Flash JS
JavaScript graphics and games engine with API familiar to Flash one. Just look to examples sources.