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
Svgo
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
X3dom
X3DOM. A framework for integrating and manipulating X3D scenes as HTML5/DOM elements.
Dagre
Directed graph renderer for javascript
Maker.js
📐⚙ Library for creating 2D vector drawings for CNC and laser cutter machines.
3 Dmol.js
WebGL accelerated JavaScript molecular graphics library
Cannon.js
A lightweight 3D physics engine written in JavaScript.
Proton
A particle engine for html5
Pixastic
JavaScript Image Processing Library
P2.js
JavaScript 2D physics library
Open Jscad.org
OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via WebGL.
Oimo.js
Lightweight 3d physics engine for javascript
Two.js
A renderer agnostic two-dimensional drawing api for the web.
jQuery.panzoom
A jQuery plugin for panning and zooming elements using CSS3.
Litegl.js
Lightweight Javascript WebGL library for handling Context, Meshes, Textures and Shaders. Relies on glMatrix 2.0, very easy to use.
Photo Swipe
PhotoSwipe is a HTML/CSS/JavaScript based image gallery specifically targeting mobile touch devices