XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
Stopwatch - A Java countdown timer and stopwatch. Features a fullscreen and a resizable window mode.
Gestimer - For those little reminders during the day
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
Stopwatch - yeahit - Minimal stopwatch
wnr - Better than pomodoro, this timer app balances work and rest.