Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
vClock - Web based time tools including Alarms, Timers, Stopwatch, and World Clocks. vClock is customizable and has a clean user interface.
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
YAPA-2 - YAPA-2 is a minimalistic desktop timer app for Pomodoro Technique users.
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
YAPA - Pomodoro timer