Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Zen Form
Add distraction mode for forms
Inputex
A javascript framework for YUI to build fields and forms.
Starability
Accessible rating forms with cute animations on top.
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 :)
jQuery Timepicker
Adds a timepicker to jQueryUI Datepicker
jQuery Validation
jQuery Validation Plugin
Sc Editor
A lightweight HTML and BBCode WYSIWYG editor
Webuploader
It's a new file uploader solution!
jQuery Textcomplete
Introduce autocompleting power to textareas, like GitHub comment forms have.
Jquery Tokeninput
Tokeninput is a jQuery plugin which allows your users to select multiple items from a predefined list, using autocompletion as they type to find each item. You may have seen a similar type of text entry when filling in the recipients field sending messages on facebook.
Fine Uploader
Multiple file upload plugin with progress-bar, drag-and-drop.
Jasny Bootstrap
The missing components for your favorite front-end framework.
Validate.js
Lightweight JavaScript form validation library inspired by CodeIgniter.
Form
jQuery Form Plugin
jQuery Smart Auto Complete
AutoComplete plugin with smart defaults and flexibility to customize
Cleave.js
Cleave.js has a simple purpose: to help you format input text content automatically.