I've found secure scuttlebutt (www.scuttlebutt.nz) really impressive. By using public servers called pubs as meeting point they can ignore lots of issues like N

I've found secure scuttlebutt (www.scuttlebutt.nz) really impressive. By using public servers called pubs as meeting point they can ignore lots of issues like NAT punching and discovery. I don't like that it seems to be based on an immutable log but it showcases well how much is possible with offline first, sync when possible software (just like syncthing)