FormValidation

Plugin para validação de formulários através da inserção de tags. É possível mostrar mensagens de erros personalizadas.

iForm

An intelligent jQuery plug-in for web form autocorrection.

jQuery Populate

A small yet useful jQuery plugin that populates select elements with option nodes.

StickyForms

Automatically saves all form fields into cookies, and then autofills those values on any form that shares element IDs across your site.

jQuery Bill Address

This will copy one address to another, like for billing and physical addresses.

jquery.imposeFormat

Unobtrusively impose a consistent format on form inputs

jQuery defaultValue

Retrieving, setting and sync defaultValue with value property of HTML form elements via jQuery

jQuery Form Serializer

Simple and powerful form serializations with jQuery

jquery.capsChecker

jquery.capsChecker is a jQuery plugin to check whether caps lock is turned on. It is the only plugin of its kind, which can recognize caps lock on numbers. That’s important for users with standard German keyboard layout.

jQuery PrefillForm

Simply pre-fills form inputs based on JSON data passed in, or it can find the correct form and fields to autofill.