Wolfpack is software for an Ultima Online MMORPG server. Gameplay is scripted using Python and XML. You need EA's Ultima Online to play on Wolfpack servers.
Middle of Nowhere is an LP mud. The project
consists of the mudlib, LPC driver (based on
MudOS), and Website code using the Uttu Perl
module. The system supports MySQL for storing
authentication and authorization information and
IMAP for email and mud-mail.
Lune is a MUD server written from scratch in the lightweight programming language Lua. It has ANSI color, ASCII wilderness maps, and is quite simple and flexible. It runs in Windows, or any POSIX system such as Linux or Mac OS X.