Avalon (MUD game)

Avalon is a role playing world (often called an RPG or MUD), a mythological environment in which you can develop your own character and interact with other real-life and imaginary beings. This is a continent of legends and detailed histories, both past and in the making. Step into this world and you may become an integral part, a major character in an unfolding tale, a great figure in the next noteworthy event in Avalon's illustrious history. Source: The Game Website.