Microjs : Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!
polyfill : polyfill makes web development less frustrating by selectively polyfilling just what the browser needs. Use it on your own site, or as a service.
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...
rsvp.js : A lightweight library that provides tools for organizing asynchronous code
emotion : emotion is a high performance, lightweight css-in-js library that supports both string and object based styles.
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.