afaik none of the current options offer fedi support.
Forgejo is a Fork of Gitea made because Gitea is managed by a For-Profit company. Their code is almost identical, in fact Forgejo is a drop-in replacement for Gitea.
Gitea and Forgejo are (iirc) both working on the same federation support but Forgejo seems to be further ahead since they announced that they'll upstream the Federation code to Gitea.
What does being federated mean in this case? Git is already distributed. Is it just for discovery, or do you mean for things like issues and discussions?
You'll be able to (among other things) open a merge request from another instance. Gitlab and other source forges require you to create an account on each instance you want to contribute to.
That's great to know, thank you! I want to get my shit out of github and onto a personal federated instance asap so here's hoping forgejo can make it happen!
from a couple random comments, it sounds like the migration to Codeberg is relatively nice – if you want to do the interim step of getting out of GitHub and worry about personal instance at some later point …