jQuery : The Write Less, Do More, JavaScript Library
hunt : Library to detect when DOM elements become visible and disappear on scroll.
EnhanceJS : EnhanceJS is a new Javascript framework designed to improve the application of Progressive Enhancement by first testing browser capabilities for key J...
Raphaël : Raphaël is a small JavaScript library that should simplify your work with vector graphics on the web. If you want to create your own specific chart or...
Intern : Intern is a complete test system for JavaScript designed to help you write and run consistent, high-quality test cases for your JavaScript libraries a...
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.