Mater

Mater, by Jason Long: “a simple and purty menu bar Pomodoro app” (free) for Linux, macOS, and Windows. Perhaps too simple for some users, just twenty-five minutes, then five, with no other settings and no pausing. (I’d prefer a three-minute break.)

But I like the box in the menu bar, looking like a calendar page or scale: to my mind, it’s a better choice than a display that shows time running down by the second.

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The Pomodoro Technique Illustrated : Flow : Pomotroid