Taggle.js
Form-ready dependency-less tagging.
Pikaday
A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS
T Former.js
tFormer.js - Empower your HTML forms
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
Autosize
jQuery plugin for dynamic textarea sizing
Starability
Accessible rating forms with cute animations on top.
jQuery Textcomplete
Introduce autocompleting power to textareas, like GitHub comment forms have.
Hide Show Password
Because life's too short to waste time re-typing passwords.
Behave.js
A lightweight, cross browser library for adding IDE style behaviors to plain text areas
Alpaca
Easy HTML5 Forms for jQuery
Completely
A fresh take on autocompletion for a wonderful user experience
Inputex
A javascript framework for YUI to build fields and forms.
React Editext
Editable Text Component for React Apps
Really Simple Color Picker
Simple Color Picker written in jQuery.
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 :)