Some persistent world NWN servers might fit the bill. Some are heavy on roleplaying, and are more of chat servers with optional combat rather than a traditional MMO setting.
NWN is a great example as well. It's imho quite underrated/overlooked how ground-breaking that game was, considering it's editor- and GM-tools.
It's a bit too static though, to fit the bill of what I'm longing for. Needs less pre-made modules, more dynamic simulation - so that the game world actually evolves in response to what players are doing. ;)
