Dropzone.js : DropzoneJS is an open source library that provides drag'n'drop file uploads with image previews.
hunt : Library to detect when DOM elements become visible and disappear on scroll.
RequireJS : RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino ...
Band.js : An interface for the Web Audio API that supports rhythms, multiple instruments, repeating sections, and complex time signatures.
Protovis : Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for vi...
JavaScript Libraries for adding offline support to web apps.