iCal - share your events with your friends and see your friend's calendars.
MenuCalendarClock iCal gives you instant access to your iCal calendars from a menu bar icon.
With this app can copy events and to do items from one iCal calendar to another.
A free utility that copies events from Now Up-to-Date to iCal.
Alternative to Apple's iCal birthday calendar that has a range of features that has made it indispensable for many iCal and Address Book users.