Node.js Desktop Automation.
a 2D rigid body physics engine for the web
motion graphics library for the web
A fast and fully-featured autocomplete library
Multiple file upload plugin with progress-bar, drag-and-drop.
Next-gen, highly customizable content editor for the browser - based on React and Redux. WYSIWYG on steroids.
Keep multiple browsers & devices in sync when building websites. http://browsersync.io