Padbury Clock Screensaver - Minimal screensaver for Mac
Final Countdown - Final Countdown is a simple countdown timer just like sleeper timer on your TV that will work despite the fact your PC is powered off.
Aerial - A beautiful aerial screensaver for your Mac
Desktop Countdown Timer - Desktop Countdown Timer is a free to use countdown timer for the desktop environment of the Windows.
Fliqlo Screensaver - A screensaver that displays the time using a flip clock.
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...