TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
chron me - Online Chronometer - Online Stopwatch - Keep track of your time - Use the online stopwatch to generate a daily activity report and download it directly to your computer. Report can be edited directly en Excel.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
wnr - Better than pomodoro, this timer app balances work and rest.
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Stopwatch - A Java countdown timer and stopwatch. Features a fullscreen and a resizable window mode.