DikuMUD , also here . Developed by Pavel Curtis, based on MOO, and later managed by Erik Ostrom. Written by Brett Vickers and Brooke Paul. Includes a combat system, and some social features. Runs on Unix versions BSD, System V, NeXT Mach, and IRIX, and on Windows.
Source code is available .
Runs on Windows , and Macintosh . The first socially-oriented MUD, runs on Windows. TinyMUSH , also here , here , and here . The second spin-off of TinyMUD, written by Larry Foard. Developed by Marcus J Ranum, this was the first MUD to have universe rules written completely in an internal programming language, called U, similar to a high level language like C, making configuration of UberMUD very flexible.