T Former.js
tFormer.js - Empower your HTML forms
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 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.
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.
X Editable
In-place editing with Twitter Bootstrap, jQuery UI or pure jQuery