MUD server, based on CircleMUD code, russificated
Crossfire RPG Game Weather Patch -- Now a branch on the official repo!
Tintin++ scirpts for MUD (mmorpg)
JamochaMUD is a Java MUD/MUCK client.
A mapping tool for text-based games like text adventures, MUDs, etc.
GGMud is a cross platform modern MUD client.
Scriptable GTK based Python MUD Client
A simple command line tool that operates on Tibia automap files.
A lame multi-user dungeon engine.
LPC Coding Library and GUI