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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.
Reactive libraries for Angular
Full Featured HTML Framework For Building iOS & Android Apps
Offline storage, improved. Wraps IndexedDB, WebSQL, or localStorage using a simple but powerful API.
Filament is a real-time physically based rendering engine for Android, iOS, Windows, Linux, macOS and WASM/WebGL
A datepicker for @twitter bootstrap forked from Stefan Petre's (of eyecon.ro), improvements by @eternicode
Animate on scroll library
A lightweight and modular front-end framework for developing fast and powerful web interfaces.