XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
Timer for Mac - Timer is a complete and professional stopwatch, alarm clock, timer and clock utility for Mac.
Gestimer - For those little reminders during the day
Stopwatch - A Java countdown timer and stopwatch. Features a fullscreen and a resizable window mode.
Stopwatch - yeahit - Minimal stopwatch
TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...