AJAX Suggestions is pretty much what you might have seen with Google Suggest. The basic idea is, through AJAX, to give the user an immediate response to what they’re typing and displaying the search results their input would generate.

Form Tools is written for web developers who work on online registration sites, or sites that require any form of information gathering from their online visitors. Put simply, it is a form processor, storage and data access script written in PHP and MySQL, designed to work with any existing web form.

Autotab is a jQuery plugin that provides auto-tabbing and filtering on text fields in a form. Once the maximum number of characters has been reached within a defined text fields, the focus is automatically set to the defined target of the element.

NicEdit is a WYSIWYG editor for websites. Its goal is to be as simple and fast as possible for users of your application. NicEdit is extremely lightweight and can be easily integrated in any site with minimal impact while providing visitors an effective means to express themselves in rich text.

Uni-Form is an attempt to standardize form markup (xhtml) and css, “modularize” it, so even people with only basic knowledge of these technologies can get nice looking, well structured, highly customizable, semantic, accessible and usable forms.

Almost every site has one, one to email, or one to place comments or submit something. No you can transform the basic forms to something nice with this jQuery plugin. Just add a line of jQuery code and this plugin will transform the forms into something nice.

The AutoSuggest class adds a popdown menu of suggested values to a text field. The user can either click directly on a suggestion to enter it into the field, or navigate the list using the up and down arrow keys, selecting a value using the tab key. The values for the suggestion list are to provided as XML (by a PHP script, or similar).

The OS X search box is an integral part of the OS X UI, and can be seen in a wide range of Macintosh software. It has an magnifying glass icon on the left of the input field, which serves as a pulldown for options/recent search terms.

Some lines of JavaScript code can help you to add nice effects to improve some features of your websites.

Browsers do not let you style file inputs. File Style plugin fixes this problem. It enables you to use image as browse button. You can also style filename field as normal textfield using css. It is written using JavaScript and jQuery.