qTip2 - Pretty powerful tooltips
roundSlider - A free jQuery plugin
Customized version of Nestable for WordPress-like back-end hierarchical menu creation.
A lightweight and beautiful jQuery plugin for radio and checkbox inputs.
Angularjs tooltips module, add tooltips to your elements
Simple, beautiful and powerful datepicker!
Easy and flexible jQuery tabbed functionality without all the styling.
Ajax Autocomplete for jQuery allows you to easily create autocomplete/autosuggest boxes for text input fields.
Highly customizable checkboxes and radio buttons
Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.
A tooltip library in CSS for your lovely websites.
Modal Window Effects with transitions CSS3.
Beautiful and responsive progress bars
Flowtime.js HTML5/CSS3/JS Presentation Framework