- Agora - A repository of information regarding the design and development of online multi-user environments
- Harley Hahn's Guide to Muds - An introduction to the basics of MUDs and mudding.
- Mac OS MUDding Resource - Clients, Servers and general resources for mudders on Mac OS.
- Mud Magic - Mud, mush, muck, text game listings, hosting, servers, snippets, articles and community.
- MudWorld - Text game administrator resource site. Discussions, searches, and jobs.