The Magnetic interpreter was written by Niclas Karlsson, with additional code by myself, Stefan Meier and Paul David Doherty.
The current version, Windows Magnetic 2.3 Release 14, can be downloaded from the IF-Archive, as can the source code and ports to systems other than Windows, in the Magnetic interpreter section. Extracting the game data from the original releases can be a complex process; for more information see the Magnetic page at Stefan's Magnetic Scrolls Memorial web site.
Here you can see a couple of screenshots of the interpreter in action:
