jQuery is a fast, concise, JavaScript Library that simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages.

Download animated progress indicator GIFs for your AJAX-fueled application.

Sajax is an open source tool to make programming websites using the Ajax framework as easy as possible.

Taconite is a framework that simplifies the creation of Ajax enabled Web applications. It's a very lightweight framework that automates the tedious tasks related to Ajax development, such as the creation and management of the XMLHttpRequest object and the

Jim Plush's AJAX library: easy AJAX, complete control.

Ajax Agent is a very easy to use, yet very powerful open source framework for rapidly building Ajax or Rich Internet Applications (RIA). For the PHP version, it takes only three lines of code to invoke a remote scripting call.

AjaxCore is a PHP framework that aims the ease development of rich AJAX applications, using Prototype's JavaScript standard library.

Saja is an open-source AJAX scripting engine for PHP, with secure function calls. It is designed for the speedy creation of simple, intuitive, and maintainable AJAX applications, without the need to write any JavaScript.

Jitsu contains an integrated set of tools to enable developers to build and deploy sophisticated user interfaces for web applications. These include an Xml markup language, page compiler, data binding engine, JavaScript runtime, control library, runtime i

phpAjaxTags is a port to PHP from the Java tag library, "AjaxTags". It's designed to simplify the use of Asynchronous JavaScript and XML (AJAX) technology.

Ajax-tutorials.com is a hand-picked, carefully selected, extensive listing of over 300 AJAX resources.

Ajax examples with xajax + Code Igniter

CrossSafe provides secure cross domain JSON requests and partially implements the JSONRequest specification (the get and cancel methods). CrossSafe allows fast, direct, and secure connections to foreign servers from the browser.