Well, out of curiosity I went to check on Flarum.
It looks great, in some way it’s similar to discourse ( in terms of design ), but it is build on php ( which is preferred by some, easier to install for eg ).
I was going to list of all of discourse great features, community and blablabla… before I realise that Flarum is still beta and unstable according to this page:
https://flarum.org/docs/install.html
It’s specifically written that it should not be used in production.
Better stick with Discourse…