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Thyme - The task timer for OS X.
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
LClock - Longhorn systray clock program
wnr - Better than pomodoro, this timer app balances work and rest.