Based on a comprehensive review of cloud platforms, it seems that there are no new forum software, so I would like to summarize: The design of Discourse is way betterthan any of the ones suggested by contributors to the topic above. If you would like to make the design of the forum even better, you could try to post something in Love Nextcloud - a discussion about Forum design. Admittedly, I am one among the silent majority of NCloud users who aren’t serious enough about Discourse, i.e the software running the forum, to offer organized and thoughtful suggestions there yet remain deferential to the traditions of that community.