What open-source software would you like more people to know about?

https://reddthat.com/post/47032660

Syncthing: Continuous, private, and encrypted file synchronization across multiple devices without using the cloud.
I’d love to use this but I just mostly don’t use multiple devices at the same time, so I don’t see how the sync would ever happen.
I have an instance on my phone running 24/7 which does the bridge. But i dont use much storage, i mainly work with text files, so the pc at work syncs with my phone, and when i get home my own pc gets the files from my phone immediatly. Its been working really well for years for me.
Yea my big problem is also that I need way more storage than what I have on my phone.