Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Online timer - Online timer is a free and easy-to-use tool that comes with a very simple way to get done with measuring time and alarm.
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Timer Tab - Online countdown timer, alarm clock, and stopwatch.
wnr - Better than pomodoro, this timer app balances work and rest.
Gestimer - For those little reminders during the day