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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Cyclework Alternatives
Cyclework is described as 'A minimal pomodoro timer' and is a Pomodoro Timer in the office & productivity category. There are more than 25 alternatives to Cyclework for a variety of platforms, including Mac, Windows, Linux, Web-based and iPhone apps. The best Cyclework alternative is Super Productivity, which is both free and Open Source. Other great apps like Cyclework are Pomodorolm, Pomatez, Presto Time Tracking and pomo.