List of JS game engines. You can find a wikified version at https://github.com/bebraw/jswiki/wiki/Game-Engines. Feel free to modify that. I sync it here every once in a while.

gameengines.md

IMPORTANT! Remember to check out the wiki page at https://github.com/bebraw/jswiki/wiki/Game-Engines for the most up to date version. There's also a "notes" column in the table but it simply does not fit there... Check out the raw version to see it.

This table contains primarily HTML5 based game engines and frameworks. You might also want to check out the [[Feature Matrix|Game-Engine-Feature-Matrix]], [[Game Resources]] and [[Scene Graphs]].

Name	Size (KB)	License	Type	Unit Tests	Docs	Repository	Notes
Akihabara	453	GPL2, MIT	Classic Repro	no	API	github	Intended for making classic arcade-style games in JS+HTML5
AllBinary Platform	Platform Dependent	AllBinary	2D/2.5D/3D	no	API	github	J2ME, Android, J2SE, HTML5, and more in 2013 (Adobe/Flash and Native)
bdge						github	Badly Design Game Engine, an HTML5 Javascript game engine Demo.
Canvex			FPS				An experimental browser-based FPS game engine in the HTML tag. Created in 2006
ChesterGL		MIT	2D (WebGL/Canvas),iso,ortho		tests	github	ChesterGL is a simple scene-based 2d rendering engine, with full support for WebGL and a simple (automatic) fallback to canvas when there's no WebGL support. Support time-based actions and animations as well as TMX files and spritesheets.
ClanFX			Tile based				clanfx is a 2D, tile-based Javascript game engine developed using Javascript and CSS. It currently works in Firefox, Epiphany and Opera browsers. Features include many animated sprites, spell effects, buildings, tiles/textures and basic game AI.
Cocos2D		MIT	2D		API	github	Cocos2d-javascript is a 2D game/graphics engine based on cocos2d-iphone but designed to run in the web browser. It uses the latest features available in HTML 5 allowing real-time rendering of 2D graphics without the need for plug-ins such as Adobe Flash
cssgameengine							Javascript Game Engine with CSS. Aimed for beginners
Effect Games							Effect Games provides free, online tools for building, sharing and playing your own browser based games.
enchant.js		GPL, MIT
EntityJS	27kb	MIT	2D	yes	API	github	Flexible javascript game engine utlizing entity-component design. Supports sprites, animation, collision, keyboard, mouse, math and more.
Flambe
Flax		Apache 2.0					Not released yet. Uses GWT and HTML5. Focus on web-based gaming for GNU/Linux and Mac OS X. About
GameJs	20-80KB	MIT	2D	yes	API. Tutorial	github	similar to PyGame (easy) for Canvas only. CommonJs modules. Comes with development server (only Java needed).
gameQuery		MIT			API. Docs	github	gameQuery is a jQuery plug-in to help make javascript game development easier by adding some simple game-related classes. It's still in an early stage of development and may change a lot in future versions.
GammaJS		MIT	2.5D Platform	Tests	API. Tutorials. Topics	github	Gamma is a new Javascript library which can be used to create 2.5D platform games for a web browser using the power of HTML, JavaScript, CSS and WebGL.
Gamvas Web	40KB	MIT	2D	No	Docs API	google code	Javascript / HTML5 Game Framework with Box2D physics integration. Demos
Gladius		MIT	3D	yes		github	Modular 3D engine, w/ entity/component system, event system, extension framework
gTile			Tile based
The GMP Javascript Game Engine		GPL2, MIT			API. Manual		Emphasis on speed and simplicity, "easy to learn and use"
Hydrax		MIT				github	Haxe port of the PushButton Engine, works with js (css and canvas), flash, and soon C++.
ingenioJS	<2KB	GPL	2D/2.5D RPG Engine		yes,included	github	JavaScript / HTML5 RPG Game Engine. Its structure allows independent rendering methods, such as WebGL, Canvas or DOM Elements. By default it makes usage of DOM Elements and a 2D environment. Currently Tile-Based and 2D, can be easily used for 2.5D and other Rendering Methods.
j5g3		GPLv3				github	Still WIP
The Javascript 2D Game Engine		GPL					Emphasis on gravity/physics/collision detection; uses HTML5 Canvas and ExplorerCanvas for IE support. Focus on limiting CPU usage.
Jaws	33KB (minified), 86KB (full)	LGPL	2D	Test Suite	yes	github	Jaws is a HTML5 2D game development library written in javascript. Sprite, viewport, gameLoop, input handling etc. The core to create a 2D game. Comes with examples.
Jest	30KB (minified), 58KB (full)	MIT	2D	not yet	Demos	github	Jest provides a way to rapidly create JavaScript (HTML5) games using the canvas element. Includes a few samples currently with more on the way.
jGen			Isometric		wiki	google code	An attempt to recreate "old school" isometric techniques in the modern web browsers without using a canvas, with only JavaScript and HTML. Map editor online demo
Jomoho JS		MIT	2D			github	Framework for quick game sketching. features: preloading, animations, sound, input, tile Engine, fullscreen, requirejs asynchronous modules
jsGameSoup		LGPLv3	2D		API	bazaar / google code	Cross browser event handling. Game entity management. Rudimentary polygon, box, circle collision detection. Sprite management. Fast, deterministic random number generator. Networking (ajax) abstraction layer. Basic cookie management. Auto-init to launch code attached to a specific HTML canvas.
js-verge		MIT	2D			github	A javascript game engine largely based on (and importing file assets from) the VERGE game engine. Demo
LimeJS		Apache License			API	github	Special attention to touchscreen devices. HTML5 game framework for fast, native-experience games for all modern touchscreens and desktop browsers.
MelonJS		unknown				github	Can use Tiled Map Editor, the engine is declared "lightweight"
Monwarp						github	Simple game engine based on using dojo toolkit with box2dweb integration.
Paladin
PixieEngine		MIT		Yes	Docs Tutorials	PixieDust IDE	Hosted IDE with easy import and export. CoffeeScript support.
Play My Code		Free to use		No	Docs		Hosted IDE with asset management and image editing. Uses own language that compiles to JavaScript/HTML5.
PlayN		Apache 2.0		yes	Docs	Google Code	HTML5 Canvas and WebGL, plus Flash, Android and JVM backends
PropulsionJS	19.6KB	MIT			API	github	Uses HTML5 Canvas element
Pulse	84KB	MIT	2D	some	API	github	Focuses on high performance 2D games using HTML5 canvas.
pp3Diso	44KB	CC BY-SA 3.0	2D Isometric	no	Docs		To display and manage an 2D isometric map. JavaScript and HTML. Compatible IE6+, Firefox, Safari, iOS, Android, Chrome, ...
QuarkJS			2D				Successor of CasualJS.
Red Locomotive			2D, 2.5D
The Render Engine		MIT	2D		API. Tutorials	google code	Object oriented. Cross-browser. Extensive API. Open-source. Supports canvas and DOM rendering. Support for Touch Input. Box2DJS Physics Engine Features
Rosewood			2D			github	Rosewood is a JavaScript library/engine for creating 2d browser-based games that are somewhat in the spirit of old 16-bit games.
RPG JS
Sarien.net interpreter		GPL	2D Adventure			google code	Focuses on making classic Sierra style adventure games.
Sprite.js	23K	BSD	2D	HTML5 Game framework	API	github
Steppe			2.5D				Raycast landscape renderer, not full engine (yet). 2D canvas, no WebGL! Includes a PHP port for server-side rendering where the HTML5 canvas element isn't supported.
Traffic Cone		MIT	2D-2.5D			github	Traffic Cone is a 2D and isometric tile based game engine written for html5. It makes complex animations of sprites and tiles based worlds fairly simple.
Tom's Halls			Platform
TuteiJS		MIT	2D			github
vegalib		LPGL				google code	A library and other related tools for creating games using Vexi
xc.js		BSD	2D		Docs	github	xc.js is a framework for HTML Canvas games in Javascript
WebSonic		BSD	3D		Docs	github	WebSonic is a Sonic engine showcased on Sonic Retro in 2010

Lightweight

Name	Size (KB)	License	Type	Unit Tests	Docs	Repository	Notes
atom	2.8	BSD	2D, minimal			github	A tiny game library intended to get out of the way and let you write your game.
Crafty	8.7KB	GPL, MIT			API	github	A lightweight, modular JavaScript game engine to easily produce high quality games. Includes a large variety of components such as animation, event management, redraw regions, collision detection, sprites and more
Mibbu	4.35KB (gzip 1.81KB)	MIT	micro-framework for fast prototyping		Mibbu page	github	blog post
Squarepig	8K	zlib	2D	no		github	A simple framework for learning and jamming.

Commercial

Name	Size (KB)	Pricing	Type	Docs	Notes
BXG	150		2D, Isometric, Orthogonal, Hexagonal
Construct 2		Early adopter, $32 or $169 + Free Version	2D		Construct 2 is a visual HTML5 game development tool for Windows. Aimed for both beginners and advanced users.
Float Engine		2D, Isometric and Tile Based			Float Engine is a 2d,isometric and tile based game engine built entirely using existing native web technologies such as HTML5, CSS3 and JavaScript
Geom		$69	2D	Docs	Javascript / HTML5 Game and Content Engine with Pro Editor.
Impact		$99	2D	Docs. API	Javascript / HTML5 Game Engine with world editor. Video tutorial
Isogenic Engine		Commercial + Free Version	Isometric & 2D	Docs & API	HTML5 Isometric & 2D Game Engine. Emphasis on real-time persistent worlds, MMO games & plugin architecture, micro-transactions, cloud-based hosting. Realtime networking. Support for canvas and HTML-based output, Node.js + MongoDB. Physics support using Box2D.
Playcraft
UltimateJS			2D		Cross-platform, target mobile platforms. Box2D integration. Scene Editor. Cross-platform sounds. github
Unity3D			3D		JS backend

Inspired by Flash

Name	Size (KB)	License	Type	Unit Tests	Docs	Repository	Notes
ActionJS				no		github	AS3 like in Javascript
CasualJS	215kb zipped	Apache 2.0	2D, Flash-like	no	API	google code	CasualJS provides seamless transition to HTML5 from ActionScript 3.0. Features include frame-based rendering and object collisions.
Doodle-js	17k, gzipped	BSD	2D, Flash-like			github	JavaScript animation library for Canvas. Features a scene graph and event handling. Easy to add to an existing page element where Flash no longer displays.
EaselJS	575kb zipped	MIT	2D, Flash-like		API	github	Developed by Grant Skinner, retained graphics mode for canvas including a full, hierarchical display list.
FlashJS		Apache 2.0				github	Uses Flash development model that is verified for years. Also good for everybody who knows Flash. About
FlixelJS		MIT	2D			github	Demo Port of Flixel (Flash) to JS. Announcement thread
IvanK	60k	Free software, original source not open
Spaceport	spaceport.js is 30K	Commercial	2D, Flash-like	yes, not publicly available	API		Supports multiple targets (iOS, Android, Flash, HTML5). Same API as ActionScript 3, hardware accelerated vector graphics automatically converted from Flash SWFs

Obsolete

Name	Size (KB)	License	Type	Unit Tests	Docs	Repository	Notes
Aves		Commercial					Obsolete. Company bought by Zynga. E3 2010 Aves Engine Prototype "Suburban World"
Diggy		BSD				github	DHTML-based, abandoned
Hydra		MIT				github	Geared towards mobile, powering a few small commercial games. There's no documentation at all, so I wouldn't recommend it to users, but some pieces may be of interest to other engine developers, such as: How to build a library compatible with Closure Compiler's advanced optimizations, using CSS3 transitions for game animation in a sane way, and abstracting touch events to allow the use of a mouse when playing mobile games on the desktop
Javascript Gamelib		GPL					Abandoned. Provides relatively simple routines for animation, sprites, collision detection and control.
Rocket Engine		Commercial					Obsolete. Company bought by Disney. Canvas support. WebGL support. Supports IE8, Mobile. Orthographic and isometric tile rendering. Collision detection. Pathfinding. Real-time multi-user Level editor. Common services required by MMOs. Demo
SpellScript			Online/MUD				WIP

What about FrozenJS? http://frozenjs.com
It looks very promising.

What about iioengine? http://iioengine.com/

Here's another open source engine http://www.puzzlingideas.com/match

Phaser : http://phaser.io/

Really fun, flash inspired framework with a lot of awesome support

+1 for Phaser

GammaJS no longer use gammajs.org domain

+2 for
Panda.js http://pandajs.net
&
Pixi.js http://pixijs.com

FYI, your Cocos2D JS link is sketchy and probably infected with malware.

Where are Phaser ?!?! O.o
It have 10.9k+ stars on github (no one you listed have that)

+1

https://github.com/lufylegend/lufylegend.js

What's the most popular game engine?

https://github.com/Rabios/Pancake