jQuery.appear is a jQuery plugin for tracking element's appearance in browser viewport. It's licensed under MIT license.
jqGifPreview is a jQuery plugin tocreate GIF preview just like Facebook. This plugin use first frame of GIF image as preview image.
A tutorial about creating a simple jQuery Accordion with unlimited nesting.
CurrencyFormatter.js allows users to format numbers in a variety of currency formats. It contains 155 currency definitions, and 715 locale definitions right out of the box, and can handle unusually formatted currencies, such as the INR and is completely configurable.