User-friendly and powerful calendar.
If you're looking for a different, well-designed calendar for your Mac but still need the data saved in your iCal, then this resourceful calendar could be the right one. PreMinder for Mac allows importing and syncing of all important data and events from iCal and comes in a well-designed, multiwindow interface.
Display the Gregorian and Hijri dates side-by-side.
Take your hectic to-do list and calendar and turns them into a workable plan.
iCal-integrated menu bar calendar.