Lunr.js
A bit like Solr, but much smaller and not as bright
Jquery Transit
Super-smooth CSS3 transformations and transitions for jQuery
jQuery Mobile
jQuery Mobile Framework
Spin.js
A spinning activity indicator
Smooth Scrollbar
Customizable, Pluginable, and High Performance Scrollbars!
Should.js
BDD style assertions for node.js -- test framework agnostic
Sequence
The Responsive Slider with Advanced CSS3 Transitions
Pushy
Pushy is a responsive off-canvas navigation menu using CSS transforms & transitions
Protractor
E2E test framework for Angular apps
Casper JS
Navigation scripting & testing utility for PhantomJS and SlimerJS
Bottlejs
A powerful, extensible dependency injection micro container for JavaScript applications
Tus Jquery Client
A jquery plugin implementing the tus resumable upload protocol.
Rill
:left_right_arrow: Universal web application framework.
Quixote
CSS unit testing
Dragscroll
tiny library for drag-n-drop scrolling style
Audio5js
The HTML5 Audio Compatibility Layer
Trmix
apply CSS based on your browser's text rendering engine