Tungstenjs
Tungsten.js is a modular framework for creating web UIs with high-performance rendering on both server and client.
Inject
AMD and CJS dependency management in the browser
W2ui
JavaScript UI library for data-driven web applications
Vegas
Vegas is a jQuery plugin to add beautiful fullscreen backgrounds to your webpages. It even allows Slideshows.
Siema
Siema - Lightweight and simple carousel in pure JavaScript
Selectize.js
Selectize is the hybrid of a textbox and <select> box. It's jQuery based and it has autocomplete and native-feeling keyboard navigation; useful for tagging, contact lists, etc.
Phantom Css
Visual/CSS regression testing with PhantomJS
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Onionskin
A client- and server-side multi-layer cache manager library
JSHint
JSHint is a community-driven tool to detect errors in JavaScript code and enforce your team's coding conventions.
Gyronorm.js
JavaScript project for accessing and normalizing the accelerometer and gyroscope data on mobile devices
Flakes
Flakes is an Admin Template Framework. A combination of CSS Libraries, JavaScript Libraries and Design files that help you build business tools very quickly.
Animate.css
Cross-browser CSS3 animations. Plug and play. Do a little dance.
Stringformatter
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Vivus
JavaScript library to make drawing animation on SVG
Vide
Easy as hell jQuery plugin for video backgrounds.
Tabris Js
tabris.js - native apps in JavaScript