Pliim - One click and be ready to go up on stage and present!
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Hidden Bar - A ultra-light MacOS utility that helps hide menu bar icons.
wnr - Better than pomodoro, this timer app balances work and rest.
Hocus Focus - A Mac menu bar utility that hides your inactive windows
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows