1. About.com: Multi-User Dungeons
Article featuring background information and resources.
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2. An Atlas of Cyberspaces - MUDs and Virtual Worlds
An atlas of maps and graphic representations of the geographies of the new electronic territories of the Internet, WWW and other emerging Cyberspaces.
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3. Basic Information about MUDs and MUDding
FAQ about MUDs and MUDding.
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4. Code begets community
Information about Daniel Pargman's Ph.D. thesis on the social and technical aspects of managing a virtual community, a study of a Swedish MUD. Sample chapters in PDF format.
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5. DikuMUD Family Tree
Listing of MUD codebases by heirachy for Diku and all code bases.
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6. Games/mud FAQ Index
Listing of online FAQ for MUD's.
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7. Intermud Protocols
An overview of the protocols that connect different MUDs together, providing intermud chat-channels and other information.
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8. Journal of Virtual Environments
Academic journal devoted to MUDs and their uses. Formerly known as the Journal of MUD Research.
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9. MUDdy Waters
Detailed information about the MUDding community. Features reviews, resources and message boards.
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10. MUSE Ltd.
Purveyors of fine, online games since 1985; principal products are MUD2 and the MUDDLE programming language and development system, both available for commercial licensing.
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11. Richard A. Bartle - Players Who Suit MUDs
Find out what sort of Mud player you are - an achiever, explorer, socializer or killer.
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12. The Center for Imaginary Environments
Supports reality modeling technology and multi-user environments. Members are active in the development of mud software using the LPC and Java languages.
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13. The MUD2 Archives
Collected stories, poetry and memories from the VAX and later incarnations of MUD2.
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14. Vae Victus
Contains news, logs, history, and a message board.
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15. XYZZYnews: Dungeons, Dragons, Shovels, and Telepathy
A brief look at MUD design, by Miron Schmidt.
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