Dropzone is an easy to use drag'n'drop library. It supports image previews and shows nice progress bars.
Fast, flexible, and lean implementation of core jQuery designed specifically for the server.
Reactive libraries for Angular
Offline storage, improved. Wraps IndexedDB, WebSQL, or localStorage using a simple but powerful API.
A datepicker for @twitter bootstrap forked from Stefan Petre's (of eyecon.ro), improvements by @eternicode
Animate on scroll library
Leverage the future of the web platform today.