I'm actually surprised that I don't remember any turn-based elements from any of the many, many M*'s I played given the strong relation to traditional RPGs - the only big time-based event was when servers reset.
Archmage (magewars.com, probably the first really big browser game) was the first game I remember waiting for my next turn to be available on. Apparently there's a "reincarnation" of it running today. https://wiki.the-reincarnation.org/Archmage
As one of the most annoying kids in the CD/LPMud scene I am likely still responsible for more MUDs being banned from InterMud than anyone else - I would wiz just about anywhere I could to stalk and occasionally harass friends and enemies alike. (The name Moles has been banned on most remaining CD muds since 1994.)
The one place they could never ban was the TMI/MudOS development MUD - I don't even remember what it was called, but looking at what the folks from there are doing today... boy, I should've spent a lot more time actually trying to get to know them instead of bugging the people I played with elsewhere.
I think Andy (dros) is a Linux filesystem contributor working at NetApp. Definitely interesting stuff from many of the monkey.org users all over the interwebs!
I don't know anything specifically about monkey.org but I went to high school with the user "dros" in the late 90's when local BBS's (Grex and M-Net) were still kind of cool and it was even cooler to have your own.