Protovis : Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for vi...
Push by Nickersoft : A compact, cross-browser solution for using the JavaScript Notifications API
Leaflet : A Modern, Lightweight Open-Source JavaScript Library for Interactive Maps
Vex : Vex is a modern dialog library which is highly configurable, easily stylable, and gets out of the way. You'll love vex because it's tiny (6kb minified...
Aloha Editor : Aloha Editor is an open source WYSIWYG editor that can be used in webpages. Aloha Editor aims to be easy to use and fast in editing, and allows advanc...
Rainbow is a code syntax highlighting library written in Javascript.
It was designed to be lightweight (1.4kb), easy to use, and extendable.
It is completely themable via CSS.