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Contacts and calendars sync without a server (Syncthing + Radicale)
(forum.syncthing.net)
Welcome! This is a community for all those who are interested in protecting their privacy.
PS: Don't be a smartass and try to game the system, we'll know if you're breaking the rules when we see it!
Some of these are only vaguely related, but great communities.
I love Syncthing. It has solved a very important problem for me and keeps me in control of my data instead of some third party that I can't know isn't snooping on my files. I even stood up a relay server to chew up the rest of my server's monthly bandwidth allocation.