For anyone looking to run their own mud, I have recently released a Windows (.Net) mud engine. This project is 2 years in the making.

Information is avaiable at

Some quick stats:

The engine is both fast and reliable, it is Windows (.Net) based, and allows for commercial use. It is extremely intuitive and easy to use. It is aimed at users who would like to write their own codebase from scratch, but would rather concentrate on game logic than program logic. It is not open source, but works on a mudlib concept, so is easily extensible and allows plug-and-play type of customization for mudlib trading.