!!!NOTE: THIS PROJECT HAS MOVED TO GITHUB!!! RingMUD is an extensible MUD (multi-user dungeon) engine and utility set that draws inspiration from popular tabletop RPG systems and adds a dash or two of its own flavor.
This is a simple "green" adventure game with a textual user interface. The game-play may be equated to a MUD mixed with a Roguelike (Nethack). Players convert legislators to hippies by planting grass and trees and replace cities with forests and plains.
cppmudd is a small, fast and portable mud driver written entirely in C++ using either standard or widely available libraries (such as the STL). It provides, among other features, support for runtime modifications to the game, ensuring minimal downtime.
ErisMUD is a MUD/MOO engine and server written in Python and SQLite and supports many features: it has rooms, chat, NPCs, items, player creation, ANSI colors, etc. Internal commands take care of the development and maintenance.