ClocX - ClocX - freeware analog clock for Windows desktop with many features like calendar, alarms, skins, antialiasing and transparency.
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
LClock - Longhorn systray clock program
Date Reminder - Date Reminder reminds you of recurring or nonrecurring events, like birthdays, bills to pay...
DS Clock - Keep your time synchronized with Atomic Time servers, using customizable digital desktop clock with westminster chimes.
Apple Reminders - Reminders is a powerful task management application from Apple that enables users to create, manage, and fulfill tasks on time.