[filchermcurr]

MOOs have been around forever and are like more-easily programmable MUSHes. Educational institutions loved them back in the day. There's even still development of the MOO server, active social MOOs, websites running MOO as the webserver... lots of fun stuff!

If there's any interest:

Archived MOO knowledge: https://lisdude.com/moo/ Modern MOO server: https://github.com/lisdude/toaststunt/ Active social MOO: https://chatmud.com/