Don't sit at your desk all day.
This is a simple implementation of the Pomodoro Technique
It runs in the menu bar, it doesn't take a bunch of resources, and it might help you not sit at your desk all day.
Default state:
Work state:
Menu:
Notification
I like to make my notifications alerts instead of banners so that they stay around until I acknowledge them.
Icons made by Madebyoliver from Flaticon is licensed by CC 3.0 BY