JSP Web Calendar

Hi all,

I believe that this question has been asked a billion times but I didn't find what I wanted by search the forum. So here it goes again.
I am looking for some real usable JSP tag that provides a web calendar interface, the one that can be viewed in different mode(monthly, weekly, daily) and where user can enter events. Something like the Calendar control in .Net would be nice.
I'd love to know if there's such package availabe before I attemp to hack one my own.

Thank you very much!