Overdrive is a LPMUD, a derivative of the MUD written by Lars Pensji. We are running on a parser called MudOS 0.8.14 (Currently using MudOS OD-baltwanga-0.9.19-1), written by our friends at TMI (The Mud Institute), regrettably no longer in existence. Several of MudOS are Overdrive Alumni. The Mudlib we run is of our own design.
MUDs have basically two classes of people: Players and Wizards. Players are the purpose of the game, and are the mortals of the world created. Wizards were once players, but through great deeds have ascended to immortality and now shape the world for other mortals. Perhaps you too will one day cross the great gap from mortality to immortality.