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Used to play Gemstone from Simutronics in the late 90s, great game and a very large user base at its height: http://en.wikipedia.org/wiki/GemStone_IV

It's still around. :)

DragonRealms here. I spent more hours on that game than any since. Scripting ZMud was a strong early motivation to learn programming.

I used MUSHclient, which you can script with Python, Lua, JScript, VBscript, etc. It's how I started learning Python.