Materialize, a CSS Framework based on Material Design
Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.
In-browser code editor
Ajax.org Cloud9 Editor
A datepicker for @twitter bootstrap forked from Stefan Petre's (of eyecon.ro), improvements by @eternicode
the last carousel you'll ever need
Chosen is a library for making long, unwieldy select boxes more friendly.
Bootstrap 3 components built with React
Semantic empowers designers and developers by creating a shared vocabulary for UI.
Medium.com WYSIWYG editor clone.
:scissors: Modern copy to clipboard. No Flash. Just 2kb :clipboard:
fullPage plugin by Alvaro Trigo. Create full screen pages fast and simple
Date range picker component for Bootstrap
AngularJS 1.2+ native directives for Bootstrap 3.