Primogen MUD Derivatives: MUD 2 Commercial MUD 2 Derivatives: None Aber AberMUD Derivatives: None LP LPMud Derivatives: UriMUD MudOS Tiny TinyMUD Derivatives: MOO TinyMUCK TinyMUSH Diku DikuMUD Derivatives: CopperMUD CircleMUD SillyMUD Tiny MOO Derivatives: LambdaMOO CoolMUD Tiny LambdaMOO Derivatives: None Tiny TinyMUCK Derivatives: TinyMAGE Tiny TinyMUSH Derivatives: TinyMUSE PennMUSH Tiny TinyMUSE Derivatives: None Tiny TinyMAGE Derivatives: None LP UriMUD Derivatives: None LP MudOS Derivatives: None Tiny PennMUSH Derivatives: None Diku CopperMUD Derivatives: MercMUD Diku MercMUD Derivatives: EnvyMUD NiMUD Rivers of MUD LP DGD Derivatives: None Diku CircleMUD Derivatives: tbaMUD Diku SillyMUD Derivatives: None Diku EnvyMUD Derivatives: None Diku NiMUD Derivatives: None Diku Rivers of MUD Derivatives: None Diku tbaMUD Derivatives: None Diku GodWars Derivatives: None Diku SMAUG Derivatives: None Tiny SMUG Derivatives: None Uber UberMUD Derivatives: UnterMUD Uber UnterMUD Derivatives: None Tiny CoolMUD Derivatives: None Cold ColdMUD Derivatives: None Diku DikuMUD II Derivatives: None