Mixitup
A CSS3 and jQuery Filter & Sort Plugin
Idle.js
Javascript activity library for the browser. (away, idle, etc)
Flow Type.js
Web typography at its finest: font-size and line-height based on element width.
FloraJS
FloraJS is a JavaScript framework for simulating natural systems in a web browser.
Dojo
Dojo saves you time and scales with your development process, using web standards as its platform. It’s the toolkit experienced developers turn to for building high quality desktop and mobile web applications.
jQuery Tourbus
A jQuery tour/walkthrough plugin.
jQuery Snipe
jQuery plugin to add a sniper-lens-style zoom on images
Tock
Timer Object/Class. Kickass!
GLSL.js
A light Javascript & GLSL library for vizualisation and game purposes (2D or 3D).
Amaran Js
Nice, sleek and stylish notifications.
Placeholder Shiv
Tiny polyfill for the placeholder form element attribute. Requires Prototype.js.
Optics
Profunctor implementation of Lenses, Prisms, Traversals, Isos, etc.
Chem
html5 game engine optimized for rapid development
jQuery Labelauty
A lightweight and beautiful jQuery plugin for radio and checkbox inputs.
Zoom.js
zoom in on any element in the DOM
Waud
Web Audio Library
Punycode.js
A robust Punycode converter that fully complies to RFC 3492 and RFC 5891, and works on nearly all JavaScript platforms.