loglevel : Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
script.aculo.us : script.aculo.us provides you with
easy-to-use, cross-browser user
interface JavaScript libraries to make
your web sites and web applications fly.
store.js : localStorage wrapper for all browsers without using cookies or flash. Uses localStorage, globalStorage, and userData behavior under the hood.
clipboard.js : Copy text to the clipboard shouldn't be hard. It shouldn't require dozens of steps to configure or hundreds of KBs to load. But most of all, it should...
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.