The basis of Pomo Timer lies technique Pomodoro Technique developed by Francesco Cirillo in the late 1980s. You can read more about the technique on the Wikipedia page.
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Tomato Clock Alternatives
Tomato Clock is described as 'Break your work into 25-minute intervals called 'Tomatoes' with customizable lengths, browser notifications, and stats tracking for productivity' and is a Pomodoro Timer in the office & productivity category. There are more than 25 alternatives to Tomato Clock for a variety of platforms, including Web-based, Android, Mac, Windows and Linux apps. The best Tomato Clock alternative is Pacelock, which is free. Other great apps like Tomato Clock are TomatoTimer, Focus Keeper, Madoro and WorkTimer.