HexMUD
A generic C++ MUD server featuring a strategy-style hexagon map
...-based map (dynamically generated and drawn in ANSI/ASCII art) giving a basic visual representation of your immediate surroundings in addition to traditional descriptions.
Many (most?) MUD servers hard-code a specific game system, or a specific game setting within their code, but HexMUD strives to be as generic as possible in this area, allowing each separate administrator to easily build a custom code base while also gaining access to all of the core features HexMUD provides.