I'm looking for federated Q&A forums specifically focused on Linux and software-related issues. I'm not referring to platforms like NodeBB, Discourse, Lemmy, Kbin, PieFed, etc. I'm asking for specific instances that focus on Q&A about Linux and other software related issues. I know of some popular non-federated platforms like Stack Exchange, AskUbuntu, Arch Linux Forum, etc. But I'm particularly interested in federated sites.

If you have any recommendations for such forums, please share them! Thank you!