SO far seems to be working... Can't rename shares (haven't seen where to do that) and by default it uses a relay via their servers (easily disabled) but so far ... cautiously optimistic.

Cheers - N

https://wetransfer.com/

https://syncthing.net/

I'll add another in here, Had much success with FileZilla over the years. I can set my PC as a host and others can connect so works well like that.

I personally run http://www.rejetto.com/hfs/