Forms Angular
Probably the most opinionated framework in the world
Content Tools
A JS library for building WYSIWYG editors for HTML content.
Colorpicker
jQuery UI widget for color picking (similar to the one in Microsoft Office 2010).
jQuery Steps
A powerful jQuery wizard plugin that supports accessibility and HTML5.
jQuery.maskedinput
jQuery Masked Input Plugin
Fort.js
Modern progress bar for form completion.
Formvalidation
The best @jquery plugin to validate form fields. Designed to use with Bootstrap + Zurb Foundation + Pure + Semantic UI + UIKit + Your own frameworks. Star it. Try it. Buy it :)
Autosize
jQuery plugin for dynamic textarea sizing
Form2js
Javascript library for collecting form data
Pikaday
A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS
Taggle.js
Form-ready dependency-less tagging.
jQuery Autotab
A jQuery plugin that provides auto tabbing and filtering on text fields in a form
Angular Datepicker
calendar and datepicker directives for angular
Sisyphus
Gmail-like client-side drafts and bit more. Plugin developed to save html forms data to LocalStorage to restore them after browser crashes, tabs closings and other disasters.
Quill
A cross browser rich text editor with an API
Webuploader
It's a new file uploader solution!