jquip : Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.
Bespoke.js : Bespoke.js is a super minimal, modular presentation library for modern browsers, designed to foster a rich plugin ecosystem.
hunt : Library to detect when DOM elements become visible and disappear on scroll.
Microjs : Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!
Head JS : Load scripts like images. Use HTML5 and CSS3 safely. Target CSS for different screens, paths, states and browsers. Make it the only script in your HEA...
Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.