Resumable.js
A JavaScript library for providing multiple simultaneous, stable, fault-tolerant and resumable/restartable uploads via the HTML5 File API.
jQuery Autotab
A jQuery plugin that provides auto tabbing and filtering on text fields in a form
jQuery Steps
A powerful jQuery wizard plugin that supports accessibility and HTML5.
Flexi Color Picker
A pure JavaScript color picker - no images, external libraries, CSS or 1px divs.
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!
Progression.js
A jQuery plugin that gives users real time hints & progress updates as they complete forms
jQuery Super Labels
Give your forms a helping of awesome!
jQuery Chained
Chained Selects jQuery plugin.
Expanding Textareas
jQuery plugin for elegant expanding textareas
Signal R
Incredibly simple real-time web for .NET
At.js
Add Github like mentions autocomplete to your application.
Formbuilder
[Needs Maintainer] Formbuilder is a small graphical interface for letting users build their own webforms.
Really Simple Color Picker
Simple Color Picker written in jQuery.
Hide Show Password
Because life's too short to waste time re-typing passwords.
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.
Switchery
iOS 7 style switches for your checkboxes
Pretty Checkable
A jQuery plugin to replace checkboxes and radios for custom images