A MUD, or Multi User Dungeon, is an online game written entirely in text that you can connect to and play with other players, similar to an MMORPG. A telnet client is required to connect.
A list of MUD clients accessible to the blind.
A list of some of the muds I've played and found interesting over the years.
A list of codebases that compiles on the windows platform, as well as links to other code repositories.
A guide to compiling muds on a unix virtual machine, as well as a list of successfully compiled codebases.
Some logs of accomplishments or gameplay I found particularly impressive.