With the age verification for discord talks, I decided to resurrect an old phpbb2 board I had set up in the 00s for a MUD I played. But the php on my host is too new of a version, so I set up phpbb3.
I have not done anything with it beyond the the initial setup.
Sojourn/Toril MUD, and yes it still exists. torilmud.org:9999
I have not played there much in a few years.
There is a group from there that plays on avatar too iirc.