Cleave.js
Cleave.js has a simple purpose: to help you format input text content automatically.
Progression.js
A jQuery plugin that gives users real time hints & progress updates as they complete forms
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
Alpaca
Easy HTML5 Forms for jQuery
Hide Show Password
Because life's too short to waste time re-typing passwords.
Bootstrap Wysiwyg
Tiny bootstrap-compatible WISWYG rich text editor
React Editext
Editable Text Component for React Apps
Flexi Color Picker
A pure JavaScript color picker - no images, external libraries, CSS or 1px divs.
Pikaday
A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS
At.js
Add Github like mentions autocomplete to your application.
Inputex
A javascript framework for YUI to build fields and forms.
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 :)
Behave.js
A lightweight, cross browser library for adding IDE style behaviors to plain text areas
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!
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.
Completely
A fresh take on autocompletion for a wonderful user experience