Kinetic Js
KineticJS is an HTML5 Canvas JavaScript library that extends the 2D context by enabling canvas interactivity for desktop and mobile applications.
Im.js
Image Match - Project to allow compare different images pixel by pixel with good performance
Isomer
Simple isometric graphics library for HTML5 canvas
W Paint
jQuery Paint Plugin
Noisy
A jQuery plugin that adds random noise to the background of a given element.
Proton
A particle engine for html5
J Query.black and White
Clientside grayscale images on any browser
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
Obelisk.js
JavaScript Engine for Building Isometric Pixel Element with HTML5 Canvas
Pixastic
JavaScript Image Processing Library
Rimg
A responsive image solution for browsers that support mediaqueries. Pure javascript and no server-side code.
Html2canvas
Screenshots with JavaScript
Vintage JS
vintageJS - add a retro/vintage effect to images using the HTML5 canvas element
Color
JavaScript color conversion and manipulation library
Focal Point
A small set of CSS classnames to help keep images cropped on the focal point for responsive designs. Using only HTML/CSS, web authors can specify an image's focal point, which stays as the image's primary focus, while the image's available width changes on responsive webpages. Crop and re-size images depending on available width and let CSS to do all of the work, and without any JavaScript.
Drawingboard.js
A canvas based drawing app that you can integrate easily on your website.
Bonsai
BonsaiJS is a graphics library and renderer