https://en.wikipedia.org/wiki/Citadel_(software)
Funny this is maintained by folks at UW. The PNW had quite a robust BBS scene back in the 80s. Not exactly surprising that tech flourished with such inclement weather.
In the 90's I thought it would make for a wild scene in a (cyberpunk?) story where the protagonist agrees to meet up with a possible informant in a MUD bar. The two apparently idly chatting possibly state secrets while fights between fighters and magic users break out around them.