XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
Hourglass - Hourglass is the most advanced simple countdown timer for 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
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows