- Alternate Universe MUD - Alternate Universe is a free online multiplayer game, inspired by science-fiction, and entirely custom-written in Java. Includes codewars extension.
- Angalon - A medieval theme. Features sections on theme, players, beginner's guide, message board and immortals.
- Banished Lands - Sections on online help, players, areas, rules and policy, clans and brethren.
- British Legends - A port of the Compuserve incarnation of the original Multi-User Dungeon, written by Richard Bartle and Roy Trubshaw. Offers detailed assistance to new players, FAQs and a brief history.
- Forest Edge Building Manual - Information on building rooms, mobiles, objects, shops and pets.
- LegendMUD - Features a variety of historical contexts, including ancient Ireland, Homer, Queen Elizabeth, Dante's Inferno, goldrush Melbourne, and Kipling's India. Supports a variety of styles of play.
- Materia Magica - Features forums, online status indicators, and references.
- Monster - A multiplayer adventure game for VMS.
- MUDII - MUD2 is the latest incarnation of the very first MUD (Essex MUD/MUD1/British Legends.)
- Symelion - Science fiction roleplaying via web-based chatrooms.
- The World of Shadowgate - Written using Standard MUDLIB much like C++.
- UrMud - Set in ancient history featuring a self-growing ecology, advanced combat system, houses and clans.
- Ursha Null 7 - A science fiction mud. Features sections on game play and technical information.