Radicle in theory. It's P2P with optional larger nodes. Practically, the interface isn't Github 2017, but it's missing continuous integration (which they're working on, I think). The downside I see with radicle is that getting it on nix isn't easy. The version there is outdated and the radicle team kind of works in its own little bubble. They are on Zulip (where Rust is too), but... who uses Zulip? They aren't on the fediverse and don't do any kind of promotion.

However, forgejo is working towards federation with activitypub which should enable it to talk to the rest of the fediverse. However they have been working on it for years now. In some status update I read they were aiming to have something quite stable by the end of the year. Forgejo is more active with regular blog updates, a wellknown host (codeberg) and funding from NGI.

I'd prefer radicle, but realistically, forgejo is going to have a much bigger userbase in 2025 (if things go smoothly).

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