jQuery is very helpful javascript client library that helps a developer to design up web forms or create rules for validation on form elements. jQuery has man a  good numbers of form plugins that create task even more easier and some of most common are being discussed below.

jQuery Form Plugin: This is to make the processing of forms bit easier and is good to be used when submission of forms is needed to be done by ajax. It makes interaction with fields easily by a single form element, serialize form and fields. The two main methods which this plugin use are ajaxForm and ajaxSubmit.

jNice: This is used for styling up normal html web forms into beautiful web forms, checkboxes, input elements and select boxes.

jQuery Field Plugin: This plugin make it easy to interact with form fields easy as you can receive set and get values from fields quickly with varying  jQueryField functions..

jQuery Checkboxes: One of the awesome checkbox pluginm this can customize look and feel of checkbox elements with images instead of normal ticks.

Add to List: This plugin let to the dynamic addition of new elements to dropdown select box, easily. While dropping select box, it shows a text box for label and value to add new elements to the list.

Ajax File upload Plugin: This plugin upload files without refreshing the forms. This ajax file upload plugin can also customizes the html upload field into any icon.

Ajax Multiple Image upload Plugin: With features like creating thumbnails and showing images in list view this plugin can upload multiple images, simultaneously.

amSelect Plugin: This plugin provides selectbox control with features like  selecting multiple values from a drodown box and then showing them into a  drag and drop list.

Autogrow textareas: This let the autogrow textarea by height to avoid scrollbars for textarea controls.

Checkbox Manipulation Plugin: This plugin allows manipulation of checkboxes with features like toggle, check, uncheck and verify checkbox state, etc.