- About.com: Multi-User Dungeons - Article featuring background information and resources.
- 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.
- Basic Information about MUDs and MUDding - FAQ about MUDs and MUDding.
- 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.
- DikuMUD Family Tree - Listing of MUD codebases by heirachy for Diku and all code bases.
- Games/mud FAQ Index - Listing of online FAQ for MUD's.
- Journal of Virtual Environments - Academic journal devoted to MUDs and their uses. Formerly known as the Journal of MUD Research.
- 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.
- Open Site - An article with an explanation of what MUDs are, an overview of their history, and a list of variants.
- Richard A. Bartle: Players Who Suit MUDs - Discusses whether MUDs are games, pass times, sports or entertainments and suggests four kinds of player: achiever, explorer, socializer or killer.
- Vae Victus - Contains news, logs, history, and a message board.
- Building@ (3)
- Chats and Forums (4)
- Conferences (1)
- Directories (11)
- Mailing Lists (3)
- Player Pages (13)
- Resources (8)
- Web Rings (18)