Fuzzball Software
The release site for classic Fuzzball 5 and Fuzzball 6. Includes documentation, third-party support, and a starting database.
GlowMuck
A Fuzzball derivative with ANSI color and added security features. Includes links to documents and a mailing list.
Nameless MUCK
Commands and changes in the Nameless modification to Fuzzball.
ProtoMUCK
NeonMUCK derivative including GlowMUCK enhancements. Not much documentation. On going project.