Fabric.js
Javascript Canvas Library, SVG-to-Canvas (and canvas-to-SVG) Parser
Js Barcode
Barcode generation library that works in both the browser and on Node.js http://lindell.me/JsBarcode
X3dom
X3DOM. A framework for integrating and manipulating X3D scenes as HTML5/DOM elements.
Svgo
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Maker.js
📐⚙ Library for creating 2D vector drawings for CNC and laser cutter machines.
3 Dmol.js
WebGL accelerated JavaScript molecular graphics library
Proton
A particle engine for html5
Dagre
Directed graph renderer for javascript
Cannon.js
A lightweight 3D physics engine written in JavaScript.
Two.js
A renderer agnostic two-dimensional drawing api for the web.
P2.js
JavaScript 2D physics library
Open Jscad.org
OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via WebGL.
jQuery.panzoom
A jQuery plugin for panning and zooming elements using CSS3.
Pixastic
JavaScript Image Processing Library
Juxtapose
JuxtaposeJS is a JavaScript library for making before/after image sliders
Oimo.js
Lightweight 3d physics engine for javascript
Litegl.js
Lightweight Javascript WebGL library for handling Context, Meshes, Textures and Shaders. Relies on glMatrix 2.0, very easy to use.