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NodeBB is developing ActivityPub connectivity
(community.nodebb.org)
I was thinking about this the other day, if traditional forums adopt activity pub it can really open the fediverse up to niche communities with larger and already established user bases. I think it's a logical progression of the technology.
This, or jumpstart already dead ones.
Discourse also has a fedi plugin, although it's not finished yet afaik
Flarum is also working on it as part of a NLnet grant.
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;