Unobrusive AJAX tabs. There's an adaption with nested tabs: Cutterscrossing.com - JQuery Nested Tab Set. Jquery Ajax Tabs

Ajax Tabs Reloaded: based on the Havoc Studios article. Enables user to create and delete tabs without page refresh, specify default open tabs, assign different colours to each tab. When a tab is opened, the panel contents are loaded with ajax. A tab can be opened when focused on a different tab and the newly opened tab will preload it's content in the background. Each tab can have it's own javascript code that will be triggered when a certain event happens - such as Open, Close, Blur and Focus. Ajax Tabs

Load a div from another page into a div on this page. History module adds div reference into url to make forward / back buttons work. MooTools Ajax Tabs

Put your content into separate DIVs and then call a javascript function which creates the tabs dynamically. Ajax Tabs

idTabs is a plugin for jQuery that makes adding tabs into a website simple. Jquery Ajax Tabs

A tabbed sliding div, where clicking on the tabs slides the content into view. Made with jQuery. Jquery Ajax Tabs

Ajax tabs with a bar of sliding tabs to allow a longer horizontal navigation list of link tabs (which pull coontent into the panel with ajax). The current tabs postionns itself to the middle. MooTools Ajax Tabs

Automatically create an HTML tab interface using plug-and-play JavaScript. Gracefully degrades if JavaScript is not present. Supports printing. Nest one tab set within another. Cookie remembers which tab was selected. Object-oriented, extensively-commented code. MIT license. Ajax Tabs

A simple way to implement tabs on your page using CSS, a little JS, and semantic markup. Accessible for screen-readers, but it supports multiple (+ nested) tabsets on the same page and allows users to bookmark the page loading to a specific tab. Ajax Tabs

dhtmlxTabbar is a JavaScript tabbar control for creating dynamic tabbed-navigation interface. This Ajax-enabled UI component lets you add feature-rich and nice looking tabs to your site or web application. Dhtmlx Ajax Tabs

The Closeable Tab widget allows tabs to be removed. Implements the Fadeout pattern. YUI Ajax Tabs