Tomato is a Pomodoro Timer for OS X.
With Tomato you can easily manage your tasks and time them in a Pomodoro-like fashion.
Adhering to the 25/5 minute cycle is key when using the Pomodoro technique. Tomato supports you by sitting in your status bar and timing the Pomodoro unobtrusively. When the Pomodoro ends and it is time for a refreshing break, Tomato will notify you.