Github: https://github.com/suitenumerique/docs

Self-hostable, but it seems like an absolute behemoth of an application if their "non-production-use-only" docker-compose file is to be believed, and I couldn't find any production-ready deployment instructions on a quick skim. No obvious signs of federation and I didn't see anything on their roadmap, not sure it would make a lot of sense for this though.