ASP.NET AJAX Library

Coolite facilitates DialogBox, Window, form, etc. (i.e. most of the controls similar to Desktop GUIs). Is there any other library like 'Coolite Toolkit' for ASP.NET ?

From stackoverflow

• Free or fee? Telerik and Infragistics both have extensive control libraries for ASP.NET that include both server-side and client-side components. Most, if not all, of these controls would work with ASP.NET AJAX. Microsoft hosts a community control gallery with many more on their ASP.NET site.

• Free use;

  there is BackBase Ajax Framework built in Java but can be used through script blocks.

  http://bdn.backbase.com/client

  and theres WEB UI of ComponentArt,looks nice :) at componentartdotcom