Free Windows Countdown Clock - Free Windows Countdown Clock is a free Windows countdown clock and date counter for the Windows operating systems.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Desktop Countdown Timer - Desktop Countdown Timer is a free to use countdown timer for the desktop environment of the Windows.
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar