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.
Gestimer - For those little reminders during the day
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Stopwatch - yeahit - Minimal stopwatch
wnr - Better than pomodoro, this timer app balances work and rest.