jQuery : The Write Less, Do More, JavaScript Library
loglevel : Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Dropzone.js : DropzoneJS is an open source library that provides drag'n'drop file uploads with image previews.
Zepto.js : Zepto is a minimalist JavaScript library for modern browsers with a largely jQuery-compatible API. If you use jQuery, you already know how to use Zept...
Band.js : An interface for the Web Audio API that supports rhythms, multiple instruments, repeating sections, and complex time signatures.
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.