MooTools Core Repository
Realtime application framework for Node.JS, with HTML5 WebSockets and cross-browser fallbacks support.
Nice, downward compatible, touchable, jQuery dial
jQuery Paint Plugin
A fresh approach to AJAX that speeds up web applications. Progressive JSON parser with an easy interface so you can use the objects before the http response completes.
gridster.js is a jQuery plugin that makes building intuitive draggable layouts from elements spanning multiple columns
A simple, in-browser, markdown-driven slideshow tool.
Timeago is a jQuery plugin that makes it easy to support automatically updating fuzzy timestamps (e.g. "4 minutes ago").
Allows for automatic Image fallbacks for browsers that can't handle SVGs
MVC framework making it easy to write realtime, collaborative applications that run in both Node.js and browsers