What's the best open source app or utility that no one else has heard of?

(Please note that your replies may be read out and discussed on an episode of Late Night)

#VoiceOfTheMasses

@LateNightLinux

Stretchly is a fantastic break reminder app. Simple intuitive UI. Helpful tips. Helps prevent all sorts of health issues from sitting down for too long

https://hovancik.net/stretchly/

Stretchly - The break time reminder app

Stretchly