jquip : Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.
ClippyJS : Add Clippy or his friends to any website for instant nostalgia.
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...
React : A JavaScript library for building user interfaces
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.