formatter.js is a library to format user input to match a specified pattern. Credit card, phone number, currency and zip code form formatting etc...
Also there is a jQuery wrapper version too.
Selectric is a jQuery plugin designed to help at stylizing and manipulating HTML selects.
Validetta is a tiny jQuery plugin which you can do client-side validation of your forms. It aims to decrease your burden with easy usage and flexible structure.
FormHelp is a jQuery utility plugin providing contextual help on input fields in a form. Providing contextual help in a standard HTML form requires all kinds of extra HTML and CSS.
This plugin gives you an easy way to place contextual help at every input field in a form. All you have to do is insert a span element with the helptext and a reference to the corresponding input field and this plugin does the heavy work for you.
Feedback Me is a jQuery plugin allows user to easily add an animatable UI widget with a feedback form which slides from the side of the screen.
A tutorial on how to create some nice custom drop-down lists with CSS and jQuery.
There are five examples with different looking drop-down menus and lists for various purposes.
FancySelect is a better select for discerning web developers everywhere and it is easy to use.
HeapBox is plugin for jQuery that replace native HTML selectboxes in your webpages. HeapBox supports themes, events, callbacks, ajax and much more.
Chained is simple jQuery plugin for chained selects. There are two different versions.
Ion.CheckRadio is jQuery plugin for styling checkboxes and radio-buttons with skin support.
A simple and lighweight jQuery plugin for cascading dropdowns.
The plugin allows you to implement a cascading dropdown using multiple select boxes in which one select box depends on the input from one or more separate select boxes. Once one or all (depending on the configuration) required select boxes contain a value, it will trigger an event that will fire off the dependant select box so it will fetch its own list.