Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Countdown Screensaver - A Mac screensaver for counting down to a date 🖥🕐
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Timetaco - Create your own countdowns, as easy as 3, 2, 1
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
Days App - A beautiful countdown app to the events that matter to you.