jQuery Validation Plugin
Form validation made easy. The jQuery Validation Plugin provides drop-in validation for your existing forms, while making all kinds of customizations to fit your application really easy.
The mobile-friendly, responsive, and lightweight jQuery date & time input picker.
A jQuery plugin that gives users real time hints & progress updates as they complete forms.
A simple, lightweight jQuery plugin for reading, writing and deleting cookies.
Placeholder jQuery Plugin
A jQuery plugin that enables HTML5 placeholder behavior for browsers that aren’t trying hard enough yet.
jQuery File Upload
File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.