H5F
A JavaScript library that allows you to use the HTML5 Forms chapters new field input types, attributes and constraint validation API in non-supporting browsers.
jQuery Autotab
A jQuery plugin that provides auto tabbing and filtering on text fields in a form
Pretty Checkable
A jQuery plugin to replace checkboxes and radios for custom images
Progression.js
A jQuery plugin that gives users real time hints & progress updates as they complete forms
Completely
A fresh take on autocompletion for a wonderful user experience
Zen Form
Add distraction mode for forms
jQuery Chained
Chained Selects jQuery plugin.
Zxcvbn
zxcvbn, named after a crappy password, is a JavaScript password strength estimation library. Use it to implement a custom strength bar on a signup form near you!
jQuery Steps
A powerful jQuery wizard plugin that supports accessibility and HTML5.
X Sound
XSound gives Web Developers Powerful Audio Features Easily !
T Former.js
tFormer.js - Empower your HTML forms
Validate.js
Lightweight JavaScript form validation library inspired by CodeIgniter.
X Editable
In-place editing with Twitter Bootstrap, jQuery UI or pure jQuery
Validatr
Cross Browser HTML5 Form Validation.
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Inputex
A javascript framework for YUI to build fields and forms.