This is the old LP 2.4.5 mudlib that comes with the LDMud driver.
This mudlib is amended with the ability to travel to other MUDs via portals for demonstration purposes. The git commits show which changes are necessary.
All changes to implement the portals are given into public domain.
The mudlib needs LDMud 3.6.2 with Python support and the Python efun package for virtual interactives (https://github.com/unitopia-de/python-interactives).
The technology behind those portals are described in a usenet post: https://groups.google.com/g/de.alt.mud/c/UR0xHq0YARc/m/HywTEp1LMgoJ
If you want to setup a portal yourself, please contact Gnomi@UNItopia.