Ajax with less suck - (and node.js HTTP client to match)
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Filament is a real-time physically based rendering engine for Android, iOS, Windows, Linux, macOS and WASM/WebGL
Reactive libraries for Angular
Dropzone is an easy to use drag'n'drop library. It supports image previews and shows nice progress bars.
Full Featured HTML Framework For Building iOS & Android Apps
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
A lightweight and modular front-end framework for developing fast and powerful web interfaces.