Chosen
Chosen is a library for making long, unwieldy select boxes more friendly.
Chocolat
Chocolat : Responsive jQuery Lightbox Plugin
Bootstrap Switch
unofficial bootstrap switch
Alpaca
Easy HTML5 Forms for jQuery
Almond
A minimal AMD API implementation for use after optimized builds
Tungstenjs
Tungsten.js is a modular framework for creating web UIs with high-performance rendering on both server and client.
Slidebars
Slidebars is a jQuery framework for quickly and easily implementing app style off-canvas space into your website.
Buzz
Buzz is a small but powerful Javascript library that allows you to easily take advantage of the new HTML5 audio element. It tries to degrade gracefully on non-modern browsers.
Gator
Event delegation in Javascript
jQuery Autocomplete
Ajax Autocomplete for jQuery allows you to easily create autocomplete/autosuggest boxes for text input fields.
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.
Pep
Pep, a lightweight jQuery plugin for kinetic drag on mobile/desktop
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Onionskin
A client- and server-side multi-layer cache manager library
Jsviews
Interactive data-driven views, built on top of JsRender templates
Frontless
Build universal JS applications with Riot.JS
Casper JS
Navigation scripting & testing utility for PhantomJS and SlimerJS