Ajax with less suck - (and node.js HTTP client to match)
Dropzone is an easy to use drag'n'drop library. It supports image previews and shows nice progress bars.
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Reactive libraries for Angular
A lightweight and modular front-end framework for developing fast and powerful web interfaces.
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
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Animate on scroll library