Here’s a cool project by Mark Frimston – a simple text-based Multi-User Dungeon (MUD) game, which could be run on a Raspberry Pi or other low-end server.
MUD Pi is a free and open source project (that’s free as in freedom). This means that the source code is included and you are free to read it, copy it, extend it and use it as a starting point for your own MUD game or any other project. MUD Pi was written in the Python programming language.
Check out the project on Github » MUD Pi (github.com)