Dynarch JS Calendar version 1 and 2
The new calendar isn't exactly free. There was a lot of demand for a commercial version and I believe this new product it's worth the price. It includes code from various other products of Dynarch.com, such as the DynarchLIB AJAX Toolkit, which aren't free software.
New in version 1.5: the time selector is back and better than ever. ;-)
Created by Mishoo aka Mihai Bazon