Alfaws (pronounced "Alphas") is a game engine that on the most basic level resembles a MUD. It is a multiplayer network game, played across a network.
The engine itself provides much more control by the developer, the world constructor, and the player. The game engine is designed to be as modular as possible, allowing the developer to make drastic changes while the game is running.
Visit the SourceForge project site for more information on development status.