Pomodorot is a timer app which can be used to set 20 minute breaks where you move away from your computer or also can be used as a pomodoro timer. Its main difference being the ability to block the screen when its break time so that you don't ignore it impulsively.

Features:
<ul><li>Variable time options</li><li>Minimal</li><li>Easy on the eyes</li><li>Command line startup (can be used as an autostart with --start-timer arg)</li></ul>