Comic.js
Cartoon style drawing for HTML5 Canvas & Raphael.js & D3.js & SVG.js
Im.js
Image Match - Project to allow compare different images pixel by pixel with good performance
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
Fabric.js
Javascript Canvas Library, SVG-to-Canvas (and canvas-to-SVG) Parser
Soc.js
An easier way to create social icons
Scene Graph.js
HTML5 Canvas and Animation Framework
J Query.black and White
Clientside grayscale images on any browser
FloraJS
FloraJS is a JavaScript framework for simulating natural systems in a web browser.
Rimg
A responsive image solution for browsers that support mediaqueries. Pure javascript and no server-side code.
Gif.js
JavaScript GIF encoding library
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
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.
Cropper
A simple jQuery image cropping plugin.
Html2canvas
Screenshots with JavaScript
Joint
JavaScript diagramming library