I don't think anyone has ever officially posted about this game so I'd like to now. Here's the official blurb.
MUME, Multi-Users in Middle-earth, is a free multiplayer roleplaying game based upon J.R.R. Tolkien’s Middle-earth that has been continuously enhanced since fall ’91.
In MUME players can explore more than 26,000 open rooms and live in this meticulously crafted world during its late Third Age, and possibly join the Epic War between the forces of the Dark Lord and the armies of the West.
It's been around for quite some time but has been constantly updated this whole time. The community is extremely active, especially right now. I've tried a lot of other Lord of the Rings MUDs but I just haven't seen anything as polished as MUME. Really would love to meet some of you guys there whether strolling the shire, hunting for food or stealing vegetables from farms, or in the chaos of battle. Please feel free to hit me up if you decide to take a peek!
As the dwarves would say, "Barak Khazad! Khazad Aimenu!!" - Durrin