Nice, thanks. I don't use dropbox much, maybe to publicly post a file for a week or perhaps a resume longer term.
So, don't think I need this but will keep it in mind for NAT traversal or something like that.
> without a requirement for a provider, accounts, fees or your data belonging to someone else
Sounds like it is not completely true if you need a server in the cloud as a prerequisite, though maybe I misunderstood.
Syncthing is peer-to-peer, not client-server, so you don't need a server in the cloud or anywhere.