Kinetic Js
KineticJS is an HTML5 Canvas JavaScript library that extends the 2D context by enabling canvas interactivity for desktop and mobile applications.
Scene Graph.js
HTML5 Canvas and Animation Framework
Im.js
Image Match - Project to allow compare different images pixel by pixel with good performance
Vintage JS
vintageJS - add a retro/vintage effect to images using the HTML5 canvas element
Cropper
A simple jQuery image cropping plugin.
Soc.js
An easier way to create social icons
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.
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
jCanvas
A jQuery plugin that makes the HTML5 canvas easy to work with.
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.
Joint
JavaScript diagramming 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.
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
Html2canvas
Screenshots with JavaScript
Jcrop
Jcrop (official) - Image Cropping Plugin for jQuery
Svg.js
A lightweight library for manipulating and animating SVG