Formplate – A jQuery plugin to style uniformly across all screens.A global form plugin for all form styling and beautification needs.
jquery.addressfield – A simple, configurable, dynamic address field plugin with jQuery.
BoostrapValidator – The best jQuery validator plugin for form fields using Bootsrap. It is easy to use, flexible, highly compatible and full HTML5 support.
Fancyfields – A jQuery plugin to create custom form elements and custom form fields.
jQuery Validation – The jQuery Validation Plugin provides drop-in validation for your existing forms, while making all kinds of customizations to fit your application really easy.
In-Field Labels – HTML5 placeholders using jQuery. This is a simple plugin that turns properly formatted HTML forms into forms with in-field label support.
Progression – A jQuery plugin that gives users real time hints & progress updates as they complete forms.