Glslify
A node.js-style module system for GLSL!
Webgl Workshop
The sequel to shader-school: Learn the WebGL API
Shader School
A workshopper for GLSL shaders and graphics programming
Glow
GLOW is a WebGL wrapper, which focuses on easy creation and use of shaders.
Philogl
A WebGL Framework for Data Visualization, Creative Coding and Game Development
Lightgl.js
A lightweight WebGL library
Twgl.js
A Tiny WebGL helper Library
Oimo.js
Lightweight 3d physics engine for javascript
Photon
CSS 3D Lighting Engine
Scenejs
An extensible WebGL-based engine for high-detail 3D visualisation
Ejecta
A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS
GLSL.js
A light Javascript & GLSL library for vizualisation and game purposes (2D or 3D).
Cannon.js
A lightweight 3D physics engine written in JavaScript.
Math Box.js
MathBox is a (work in progress) library for making presentation-quality math diagrams in WebGL.
Gl Matrix
Javascript Matrix and Vector library for High Performance WebGL apps
Sylvester
Vector, matrix and geometry math JavaScript
Three.js
JavaScript 3D library.