A MUD client for Android, iOS, Linux, Mac OS X and Windows
MUD server, based on CircleMUD code, russificated
Cooperative multiplayer graphical RPG and adventure game
Arianne is an engine to develop multiplayer online games like Stendhal
Full featured MUD server with all the trimmings.
BattleTech MUX Client
Tintin++ scirpts for MUD (mmorpg)
JamochaMUD is a Java MUD/MUCK client.
Provides a full suite of clients and servers for virtual worlds.
GGMud is a cross platform modern MUD client.