Comment by bobbytuck

There's also zilf/z-machine -- the language/virtual machine used to write the Infocom games.

A relatively recent 'awesome' repo for z-machine is here:

https://github.com/cschweda/awesome-z-machine

And the current implementation of zilf is here:

https://foss.heptapod.net/zilf/zilf/-/wikis/home