I’m just learning about all this. Looks like P2P is what I want. Thanks

I use Calibre and its web server locally. Works great.

I noticed that some of these are apps and some are protocols. It makes sense to list the app if the protocol is proprietary, but it’s confusing that there can be multiple apps for an open protocol and not all of those apps could feature the same level of privacy.

Nice work. Can you add RCS to the table? https://en.wikipedia.org/wiki/Rich_Communication_Services