FTP.GAME.ORG Mud Archive  
   A directory of MUD server sources and other related files available for FTP, organized by server type.
   http://www.game.org/ftpsite/

Momoko  
   An open source, modular, extensible platform for building multi-user environment. Momoko transparantly distributes objects over multiple servers and supports several scripting languages. Written in Java.
   http://momoko.sourceforge.net/

16K MUD Competition Results  
   Results of a competition to write the best possible MUD server in under 16 kilobytes.
   http://www.andreasen.org/16k.shtml

DUMB MUD  
   The 'Diabolically Uncrashable MUD Builder' project aims to provide a server that is first and foremost stable and reliable. The DUMB language is a dialect of Lisp.
   http://jlmud.sourceforge.net/

The Grendel Project  
   A MUD server for Win32 written in Delphi 5. Features include multi-threaded design, copy-over procedure and IPv6 support.
   http://www.grendelproject.nl/

Muq  
   Ambitious distributed MUD server with a long list of features. One of the main aims of the project is to construct non-proprietary online communities based on free software.
   http://www.muq.org/

The AIME Project  
   An open-source MUD engine, designed to provide as much flexibility as possible to the designer creating the online world.
   http://aime.sourceforge.net

Valhalla Mud Engine  
   MUD engine by the original writers of the DIKU MUD server. Unlike DIKU, VME is available under a business license that allows commercial exploitation.
   http://www.valhalla.com/vmeinf/index1.html

New MUD Code-bases  
   Catalog of new and original MUD servers for different platforms and programming languages. Includes short descriptions and links to the project web pages and their authors.
   http://www.andreasen.org/newmud/

Kanga.nu MUD Server FTP Archive  
   Repository of MUD servers containing many old servers of historical interest, as well as new ones.
   ftp://ftp.kanga.nu/pub/MUD/Servers/

Majik 3D  
   A project to create a 3D online role-playing environment set in a medieval fantasy world. The server uses proprietary technologies provided by Taika Technologies.
   http://www.majik3d.org/

Mud Server Developer's Page  
   Information and links related to mud server development. Aims to maintain a comprehensive list of mud ports for Windows.
   http://pw1.netcom.com/~jlsysinc/index.html

CGMUD  
   Graphical MUD system ported from AmigaMUD. Has a graphical MUD client written in Java and an efficient server written in C. CGMUD is not derived from any other MUD and has no licensing restrictions.
   http://www.graysage.com/cg/MUD/CGMud/index.html

CoolMUD Server  
   CoolMUD is an object-oriented, disk-based MUD server originally written by the creator of MOO. It has support for distributed processing. This version features some bug fixes in the server and improved in-database code.
   http://www.digitalkingdom.org/~rlpowell/coolmud/index.html

KoalaMUD  
   Koala is a highly-distributed IP6/IP4 MUD server. It allows for very large game worlds to be distributed between multiple machines in a manner transparent to players.
   http://koalamud.sourceforge.net/index.php3

[rec.games.mud]: FAQ #4/4: Servers at a glance  
   Detailed information about mud server types.
   http://www.mudconnect.com/mudfaq/mudfaq-p4.html

Bluemud  
   Based on Varium project. Features documentation, research and project details.
   http://bluemud.sourceforge.net/

The MUD32 Project  
   Notes on a Windows based Mud server.
   http://www.Jaruzel.com/mud

EmberMUD  
   Flexible open-source MUD engine, capable of supporting almost any role-playing setting.
   http://sourceforge.net/projects/embermud