What lesser known free and open source software do you use daily to improve your life?

pivpn for wireguard setup:

• https://www.pivpn.io

newpipe and libretube for youtube:

• https://newpipe.net/
• https://libretube.dev/

And the entire Fossify app suite in Android:

• https://www.fossify.org/

scrcpy for connecting to my Android screen from my laptop:

• https://github.com/Genymobile/scrcpy

kde connect for general android/laptop connectivity:

• https://kdeconnect.kde.org/