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Secure Scuttlebutt which has been discussed before here.

The protocol guide: https://ssbc.github.io/scuttlebutt-protocol-guide/

Urbit

In case anyone takes this seriously, check out their code: https://github.com/urbit/archaeology-factor/blob/master/urb/...

It’d be a hilarious art project if they weren’t scamming people who doing know any better.

Lol. They’re building out an api. You can write apps in whatever language you want.

matrix

While there is a research-stage P2P effort for it[0], Matrix is federated in a conceptually similar way to ActivityPub (the federation protocol of Mastodon et al).

[0]: https://fosdem.org/2022/schedule/event/matrix_p2p_pinecone/