markItUp is a JavaScript plugin built on the jQuery library. It allows you to turn any textarea into a markup editor. Html, Textile, Wiki Syntax, Markdown, BBcode or even your own Markup system can be easily implemented.

Highlighter with keyboard navigation, can be customized easily

jVal is a jQuery form field validation plugin that provides an appealing animated message flyout that does not impede form layout/design while being user-friendly.

Learn how to make a slick content slider for a computer shop, with the help of jQuery and the MopSlider plugin.

Users hover their mouse over a letter and a columnized list of all of the list items that start with that letter appear in a submenu. Mousing off of the letter or menu closes the submenu. Mousing between letters is very fast and the columns in the submenu are nicely balanced. This is great for product lists, address books, contact lists, lists of hotels, parks and recreation areas, etc.

This plugin will resize and scale targeted images to their max width according to the image ratio, the browser size and some simple options.

A quick jQuery plugin for creating drop-down menus.

With javascript enabled a nice playlist is created, whilst without javasript the user gets a regular list of links to youtube pages.

Learn how to attach an AJAX spinner next to a form element using jQuery.

Learn how to replicate the mashable way of drag to share with jQuery and jQuery UI.