Svgo
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Two.js
A renderer agnostic two-dimensional drawing api for the web.
Image Mapster
jQuery plugin for enhancing HTML Image maps
Gif.js
JavaScript GIF encoding library
Svg.js
A lightweight library for manipulating and animating SVG
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.
jCanvas
A jQuery plugin that makes the HTML5 canvas easy to work with.
Color
JavaScript color conversion and manipulation library
Jcrop
Jcrop (official) - Image Cropping Plugin for jQuery
Fabric.js
Javascript Canvas Library, SVG-to-Canvas (and canvas-to-SVG) Parser
W Paint
jQuery Paint Plugin
Pixastic
JavaScript Image Processing Library
Im.js
Image Match - Project to allow compare different images pixel by pixel with good performance
Kinetic Js
KineticJS is an HTML5 Canvas JavaScript library that extends the 2D context by enabling canvas interactivity for desktop and mobile applications.
Noisy
A jQuery plugin that adds random noise to the background of a given element.
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Ocanvas
JavaScript library for object-based canvas drawing.