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.
Beerslider
A vanilla JS keyboard accessible plugin for any before-after comparison
Sylvester
Vector, matrix and geometry math JavaScript
Html2canvas
Screenshots with JavaScript
Ejecta
A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS
Gif.js
JavaScript GIF encoding library
Joint
JavaScript diagramming library
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.
Chocolat
Chocolat : Responsive jQuery Lightbox Plugin
Philogl
A WebGL Framework for Data Visualization, Creative Coding and Game Development
Svg.js
A lightweight library for manipulating and animating SVG
jQuery Backstretch
Backstretch is a simple jQuery plugin that allows you to add a dynamically-resized, slideshow-capable background image to any page or element. The image will stretch to fit the page/element, and will automatically resize as the window/element size changes.
Bonsai
BonsaiJS is a graphics library and renderer
Jcrop
Jcrop (official) - Image Cropping Plugin for jQuery
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.
Riloadr
Riloadr - A cross-browser framework-independent responsive images loader written in Javascript.
Flex Slider
An awesome, fully responsive jQuery slider plugin