TimeLeft - TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
Dial - Quick & beautiful macOS timer.
CountDown Kings Free Countdown Timer - CountDown Kings Free Countdown Timer is a free countdown timer for Mac OS X and Windows operating systems.
wnr - Better than pomodoro, this timer app balances work and rest.
Free Timer - Free Timer is a fully featured countdown timer for the Windows operating system by using which you can easily set the countdown timers to get the information of remaining time.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.