I'm working on websocket MUD based on MajorMUD in Elixir. There are quite a few people actively building new mud engines in modern languages in 2018. There's even a community with a slack org / newsletter etc at https://mudcoders.com/
post dat github
> There are quite a few people actively building new mud engines in modern languages in 2018.
Sometimes the Internet is a wonderful place! Not always, but there's still a lot of good stuff around.