Idle.js
Javascript activity library for the browser. (away, idle, etc)
Hydra.js
Create a scalable, maintainable and module oriented system using Hydra.js
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.
Chimee
a video player framework aims to bring wonderful experience on browser
Blend4 Web
Blend4Web is a tool for interactive 3D visualization on the Internet
Black Hole.js
Renders black hole gravitational lensing effects in an image canvas using WebGL, glfx.js, and numeric.js
Absurd
Writing your CSS in JavaScript. That's it!
Isjs
Check your data against regular expressions or known keywords.
Photobox
A lightweight CSS3 image gallery that is pretty to look and and easy to use
Stupid Table Plugin
A stupidly small and simple jQuery table sorter plugin
Nerdamer
a symbolic math expression evaluator for javascript
jQuery jKit
A very easy to use, cross platform, jQuery based UI toolkit, that's still small in size, has the features you need, and doesn't get in your way of doing things!
Validatr
Cross Browser HTML5 Form Validation.
Textillate
A simple plugin for CSS3 text animations
Phina.js
phina.js is game library
Humane.js
A simple, modern, browser notification system
Easy Pie Chart
Lightweight jQuery plugin to render simple, animated and retina ready pie charts with the HTML5 canvas element