Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Memo to Me - Online email & SMS reminder service.
wnr - Better than pomodoro, this timer app balances work and rest.
Simply Remind Me - Free email and text reminder service so you don't forget the important things in life!
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
Desktop-Reminder - Desktop-Reminder is a freeware task planner for Windows to manage your tasks and other to-dos’ in really easy way.