Memo to Me - Online email & SMS reminder service.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Simply Remind Me - Free email and text reminder service so you don't forget the important things in life!
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Kana Reminder - Kana Reminder is a program which can be used to set a reminder to be triggered at a specified time.
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows