I remember watching this project as it was getting started. It was a replacement to all those PHP forums, like PHPBB & Simple Machines BB. This claimed to have more modern features. It’s also open-source, and you can self-host or pay them for hosting. (I recommend the latter)
And since we’re on the subject, has Beehaw considered using an old PHP forum, like I mentioned earlier? They’re really basic and quite nice, IMHO.
Yes. Discourse and Forem have been top contenders, but for different reasons. Main points against them both are the lack of federation and ‘forum based’ more than aggregation style based. (Like Reddit and Lemmy formats). Discourse also has a very strict developer contribution requirement.
Developer contribution requirement?
This outline and this documentation and their developer license agreement.
As far as I know, Discourse now has an ActivityPub plugin that allows it to federate, but I don’t know much about it besides that, or what that would be like to use in practice in comparison to the aggregator styles.