[misterdata]

So, basically any local productivity tool, saving files in a synced folder.

While this works, Syncthing does not really provide anything for fine-grained collaboration or sharing (you only share full folders). Encrypted peers do allow storing files on a machine that you don’t have to trust.

[righthand]

I don't need anything from Syncthing for fine grained collaboration, the text editors do that.

[andai]

What are you looking for? I used to use Notational Velocity in an encrypted volume hosted on Dropbox, but I ended up switching to Obsidian for the mobile support.