Slit Slider
A responsive slideshow with a twist: the idea is to slice open the current slide when navigating to the next or previous one. Using jQuery and CSS animations we can create unique slide transitions for the content elements.
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.
FancyBox
FancyBox is a tool that offers a nice and elegant way to add zooming functionality for images, html content and multi-media on your webpages.
Flex Slider
An awesome, fully responsive jQuery slider plugin
Joint
JavaScript diagramming 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
Beerslider
A vanilla JS keyboard accessible plugin for any before-after comparison
Raphael
JavaScript Vector Library
Responsive Slides
Simple & lightweight responsive slider plugin (in 1kb)
Ejecta
A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS
Tremula Js
TremulaJS: Picture Streams + Momentum Engine + Bézier Paths + Multi-Device
Bonsai
BonsaiJS is a graphics library and renderer
Chocolat
Chocolat : Responsive jQuery Lightbox Plugin
jQuery QR Code
qrcode generation standalone (doesn't depend on external services)
Svg.js
A lightweight library for manipulating and animating SVG
Scenejs
An extensible WebGL-based engine for high-detail 3D visualisation
Processing.js
A port of the Processing visualization language to JavaScript.