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.
Alinof Timer - Alinof Timer is a very easy to use timer for your Mac.
Timer Tab - Online countdown timer, alarm clock, and stopwatch.
CookTimer - CookTimer is a simple cross-platform countdown timer that helps when cooking, making tea or eggs.
Timer+ · multiple timers - Timer+ · multiple timers is an all-in-one-timer application designed for your Apple device, and that allows you to be more productive with your workflow and memorize the things that are important during the day.