jCanvas
A jQuery plugin that makes the HTML5 canvas easy to work with.
Dagre
Directed graph renderer for javascript
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Chartist Js
Simple responsive charts
Svgo
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Go Js
All GoJS samples, extensions, and documentation
Isomer
Simple isometric graphics library for HTML5 canvas
Mapmap.js
A data-driven API for interactive thematic maps
Liquidfun
2D physics engine for games
Js Barcode
Barcode generation library that works in both the browser and on Node.js http://lindell.me/JsBarcode
Img to Ascii
A JavaScript implementation of a image to Ascii code
J Query.black and White
Clientside grayscale images on any browser
Breathing Halftone
Images go whoa with lots of floaty dots
Maker.js
📐⚙ Library for creating 2D vector drawings for CNC and laser cutter machines.
Fabric.js
Javascript Canvas Library, SVG-to-Canvas (and canvas-to-SVG) Parser
W Paint
jQuery Paint Plugin
Kinetic Js
KineticJS is an HTML5 Canvas JavaScript library that extends the 2D context by enabling canvas interactivity for desktop and mobile applications.