Smart Sloth - Smart Sloth uses the concept of timeboxing, which is to allocate a set amount of time to each task, therefore, creating a deadline which can increase the productivity of the user.

wnr - Better than pomodoro, this timer app balances work and rest.

MouseClock - Shows the current time next to the mouse cursor, and date and more in the tray.

Hourglass - Hourglass is the most advanced simple countdown timer for Windows.

Dial - Quick & beautiful macOS timer.

Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows