Flex Slider
An awesome, fully responsive jQuery slider plugin
Foresight.js
Foresight.js gives webpages the ability to tell if the user's device is capable of viewing high-resolution images (such as the 3rd generation iPad) before the image is requested from the server. Additionally, it judges if the user's device currently has a fast enough network connection for high-resolution images. Depending on device display and network connectivity, foresight.js will request the appropriate image for the webpage.
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.
Baraja
Baraja is a jQuery plugin that allows to move elements in a card-like fashion and spread them like one would spread a deck of cards on a table.
jCanvas
A jQuery plugin that makes the HTML5 canvas easy to work with.
Bxslider 4
Responsive jQuery content slider
Photobox
A lightweight CSS3 image gallery that is pretty to look and and easy to use
Color
JavaScript color conversion and manipulation library
Ejecta
A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS
Blueberry
A jQuery image slider plugin written specifically for responsive web design.
GLSL.js
A light Javascript & GLSL library for vizualisation and game purposes (2D or 3D).
Cannon.js
A lightweight 3D physics engine written in JavaScript.
Jcrop
Jcrop (official) - Image Cropping Plugin for jQuery
Fabric.js
Javascript Canvas Library, SVG-to-Canvas (and canvas-to-SVG) Parser
Nivo Slider
The Most Awesome jQuery Image Slider
Threesixty Slider
jQuery image slider plugin for creating 360 degree product tours
W Paint
jQuery Paint Plugin