Chosen

Chosen is a JavaScript plugin that makes long, unwieldy select boxes much more user-friendly. It is currently available in both jQuery and Prototype flavors.

jQuery UI Autocomplete

Lists suggested words as the user is typing.

jQuery UI Datepicker

Displays a calendar from an input or inline for selecting dates.

jQuery UI Slider

Displays a flexible slider with ranges and accessibility via keyboard.

jQuery UI Button

Enhances a form with themeable buttons.

jQuery UI Spinner

Displays buttons to easily input numbers via the keyboard or mouse.

Fine Uploader

Multiple file upload library with support for all major browsers. Many features such as drag & drop, auto & manual retry, file chunking, auto-resume, and more! Does NOT use Flash or Java. Highly configurable. A no-dependency version is ALSO available in the downloads section.

Selectize.js

Selectize is a jQuery-based custom UI control. Useful for tagging, contact lists, country selectors, etc.

iCheck

Highly customizable checkboxes and radio buttons (jQuery and Zepto). Features: identical inputs across different browsers and devices (both desktop and mobile), touch devices support (iOS, Android, BlackBerry, Windows Phone, Amazon Kindle), keyboard accessible inputs (Tab, Spacebar, Arrow up/down and other shortcuts), screenreader accessible inputs — (ARIA attributes for VoiceOver and others), customization freedom (use any … Continue reading

Form

A simple way to AJAX-ify any form on your page; with file upload and progress support.