> Apple had the original PARC Smalltalk

They had V1; the image provided by http://www.wolczko.com/st80 which the VM referenced in this post is based on is V2.

> There are probably a few that I missed that are still in use.

Here is one that works on the original (unmodified) Xerox image: https://github.com/rochus-keller/Smalltalk