The AJAX Control Toolkit (September 2009 Release) contains more than 30 controls that enable you to easily create rich, interactive web pages. The AJAX Control Toolkit is a community project hosted at Microsoft CodePlex.

The Microsoft AJAX Library 3.5 is a standalone collection of the standards-based JavaScript classes that are automatically included when using ASP.NET AJAX in ASP.NET 3.5 SP1. It is supported by the most popular browsers and can be used to build client-centric Web applications without using ASP.NET.

Download the preview of the next version of ASP.NET AJAX. The next version of ASP.NET AJAX includes support for client templates, live bindings, and declarative client-side controls and behaviors. The ASP.NET AJAX Preview is hosted at Microsoft CodePlex.