Cooperative multiplayer graphical RPG and adventure game
Crossfire is a free, open-source, cooperative multi-player RPG and adventure game. Since its initial release, Crossfire has grown to encompass over 150 monsters, 3000 areas to explore, an elaborate magic system, 14 races, 16 character classes, and many powerful artifacts scattered far and wide. Set in a fantastical medieval world, it blends the style of Gauntlet, NetHack, Moria, and Angband.
Arianne is an engine to develop multiplayer online games like Stendhal
...Marauroa manages the client server communication and provides an object orientated view of the world for game developers. It handles database access in a transparent way to store player accounts, character progress and the state of the world
Python AI mud is a Multi-User Dungeon written in Python, designed to give some artificial intelligence to the mud client. Multi-User Dungeons (MUD) are textual fantasy games, where a player is in a virtual world, which is only described with text.
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Arnacaw Online is an open source 2D MMORPG in development. A traditional MMORPG with many extensions, features planned include dynamic player-built worlds, a stock market, auctions, and a player-driven glyph-based spell system.
The time of Archmages will be an open-source MUD game.
Players can be connected to the game server using either a special client or through IRC or they can use a Web-interface. This means that a player can reach the server from virtually any platform.
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.
A multiplayer 3d-game where the "Whack a Mole" concept is reversed and the player is the mole. The object of the game is simply to survive in an underground laburynth.
Starlight is a MMORPG written using Ogre3D and PyGame in Python that focuses on role playing, player modifiable worlds, strong computer artificial intelligence, and peer-to-peer networking.