Yes, I received many good answers on from the #Nextcloud #community, and many more #opensource communities.

Most use the excellent #discourse software for their forums. Highly recommended!

discourse.org/

#FOSS

Discourse is the place to build civilized communities

Discourse is modern forum software for your community. Use it as a mailing list, discussion forum, long-form chat room, and more!

^{Discourse - Civilized Discussion}