Html2canvas
Screenshots with JavaScript
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.
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Joint
JavaScript diagramming library
Isomer
Simple isometric graphics library for HTML5 canvas
Croppie
A Javascript Image Cropper
Svg.js
A lightweight library for manipulating and animating SVG
Raphael
JavaScript Vector Library
Processing.js
A port of the Processing visualization language to JavaScript.
Bonsai
BonsaiJS is a graphics library and renderer
jQuery Focuspoint
jQuery plugin for 'responsive cropping'. Dynamically crop images to fill available space without cutting out the image's subject. Great for full-screen images.
Snap.svg
The JavaScript library for modern SVG graphics.
Clmtrackr
Javascript library for precise tracking of facial features via Constrained Local Models
Graphicsjs
A lightweight JavaScript graphics library with the intuitive API, based on SVG/VML technology.
Proton
A particle engine for html5
Image Mapster
jQuery plugin for enhancing HTML Image maps
Canvg
Javascript SVG parser and renderer on Canvas