jQuery Knob
Nice, downward compatible, touchable, jQuery dial
jQuery Impromptu
An extention to help provide a more pleasant way to spontaneously prompt a user for input.
iCheck
Highly customizable checkboxes and radio buttons
Messenger
Growl-style alerts and messages for your app. #hubspot-open-source
Fuelux
Extends Twitter Bootstrap with additional lightweight JavaScript controls. Easy to install, customize, update, and optimize. All functionality covered by live documentation and unit tests.
Bootstrap Datepicker
A datepicker for @twitter bootstrap forked from Stefan Petre's (of eyecon.ro), improvements by @eternicode
Animatescroll.js
A Simple jQuery Plugin for Animating Scroll
Pageguide
An interactive guide for web page elements using jQuery and CSS3
Marka
Beautiful transformable icons built for the web.
Rome
Customizable date (and time) picker. Opt-in UI, no jQuery!
Notie.js
A clean and simple notification plugin (alert/growl style) for javascript, with no dependencies.
Ng Dialog
Modals and popups provider for Angular.js applications
Angular Tooltips
Angularjs tooltips module, add tooltips to your elements
Uilang
A minimal, UI-focused programming language for web designers.
Select2
Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.