Is there a good forum stack that is as moddable as phpbb was back in the day? Every Discourse instance I see seems _very_ similar so I've assumed there's not much of an interesting plugin ecosystem
Most of it is divided up into a large number of medium-sized discrete php files.
It run on just about the most boring apache2 (or nginx), mariadb, PHP stuff...
https://www.simplemachines.org/
https://github.com/SimpleMachines/SMF
https://www.simplemachines.org/community/index.php?topic=593...
Eventually discovering a nulled vbulletin was like finding a pot of gold. You just had to be there.
https://www.phpbb.com/community/viewtopic.php?f=14&t=2672425
(I'm guessing flarum.org makes more sense, though).
A cursory search didn't turn up any golang based modern and well maintained forums, which surprised me a bit.