W Paint
jQuery Paint Plugin
FloraJS
FloraJS is a JavaScript framework for simulating natural systems in a web browser.
Im.js
Image Match - Project to allow compare different images pixel by pixel with good performance
Ocanvas
JavaScript library for object-based canvas drawing.
Soc.js
An easier way to create social icons
Comic.js
Cartoon style drawing for HTML5 Canvas & Raphael.js & D3.js & SVG.js
P5.js
A JS client-side library for creating graphic and interactive experiences, based on the core principles of Processing. http://twitter.com/p5xjs —
Joint
JavaScript diagramming library
Drawingboard.js
A canvas based drawing app that you can integrate easily on your website.
Vintage JS
vintageJS - add a retro/vintage effect to images using the HTML5 canvas element
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
Scene Graph.js
HTML5 Canvas and Animation Framework
Cropper
A simple jQuery image cropping plugin.
Rimg
A responsive image solution for browsers that support mediaqueries. Pure javascript and no server-side code.
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.