If you set the Genre here to Tolkien you can see a list of some: https://mudstats.com/Browse

> MUME is a free multi user role-playing game based upon J.R.R. Tolkien's 'Middle Earth' that has been continuously running since fall '91. The action takes place in the late Third Age, before 'The Hobbit' and after the loss of the One Ring by Sauron. The key of Erebor was just found by Gandalf and all the epic tales narrated in 'The Lord of the Rings' may take place. MUME covers 23'000+ original rooms from the mighty Dwarven Halls beyond the Gulf of Lh???n in the West to the fringes of Mirkwood in the East, and from the ruins of Fornost in the North to the fortress of Isengard in the South. In this meticulously crafted world where fantasy tales come to life players join... https://mume.org/