Fabric.js
Javascript Canvas Library, SVG-to-Canvas (and canvas-to-SVG) Parser
Svgo
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Html2canvas
Screenshots with JavaScript
Svg.js
A lightweight library for manipulating and animating SVG
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Konva
Konva.js is an HTML5 Canvas JavaScript framework that extends the 2d context by enabling canvas interactivity for desktop and mobile applications.
Go Js
All GoJS samples, extensions, and documentation
Raphael
JavaScript Vector Library
Snap.svg
The JavaScript library for modern SVG graphics.
Two.js
A renderer agnostic two-dimensional drawing api for the web.
Easel JS
The Easel Javascript library provides a full, hierarchical display list, a core interaction model, and helper classes to make working with the HTML5 Canvas element much easier.
Cropper
A simple jQuery image cropping plugin.
Js Barcode
Barcode generation library that works in both the browser and on Node.js http://lindell.me/JsBarcode
Clmtrackr
Javascript library for precise tracking of facial features via Constrained Local Models
Dagre
Directed graph renderer for javascript
Canvg
Javascript SVG parser and renderer on Canvas
Color
JavaScript color conversion and manipulation library