Mocha
A simple, flexible, fun javascript test framework for node.js & the browser. (BDD, TDD, QUnit styles via interfaces)
Tinycon
A small library for manipulating the favicon, in particular adding alert bubbles and changing images.
Lettering.js
A lightweight, easy to use Javascript <span> injector for radical Web Typography
Fit Text.js
A jQuery plugin for inflating web type
UA Parser
Lightweight JavaScript-based User-Agent string parser. Supports browser & node.js environment. Also available as jQuery plugin.
Re Marked.js
Client-side markdown generator
Css Console
cssConsole is a jquery plugin that allows you to transform DOM element into console/terminal like input.
Husl
Human-friendly alternative to the HSL color space
Flowplayer
The HTML5 video player for the web
Jstat
JavaScript Statistical Library
Radio
Dependency-free Chainable Publish/Subscribe Library for Javascript
Rye
A modern, lightweight browser library using ES5 natives
Prism
Lightweight, robust, elegant syntax highlighting. A spin-off project from Dabblet.
Holder
Holder renders image placeholders entirely on the client side.
Steal
Gets JavaScript
Pixastic
JavaScript Image Processing Library
String.js
Extra JavaScript string methods.