LittleCal Pro is a simple application with which you can schedule events in a virtual calendar quickly and easily. Schedule events, and LittleCal Pro will even remind you of them ahead of time like 10 days or 30 minutes before events are supposed to occur. Maybe, you want to get your Mac to remind you that you need to pick up your kids at 03:35 PM on Tuesdays and Thursdays? That can be done with LittleCal Pro.
System requirements: Mac OS X 10.6.6 ~ 10.6.8, 10.7.x, 10.8.x