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...
Workbox : JavaScript Libraries for adding offline support to web apps.
Tracery : A story-grammar generation library for javascript. Write grammar objects, get generative stories.
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.