I’ve been working on a project to celebrate the anniversary of MUMPS and its first standard.
For those unfamiliar, MUMPS is an imperative language famously born at Massachusetts General Hospital in 1966. Its defining characteristic is that the language and the database are deeply integrated, acting as an early NoSQL database decades before the term existed.
See here for more information about the project: https://github.com/rochus-keller/mumps/
There are pre-compiled versions of my MUMPS 76 interpreter in case you want to play with it.
I protest the characterization of Smalltalk as legacy. Seeing Cedar mentioned was very cool - Cedar/Mesa along with Trellis/Owl were environments I was very interested in during my late high school / early college days, though I had no access to either. I do have a lot of Trellis documentation lying around somewhere someone at DEC kindly sent me when I wrote them about it.
I assume you mean this project: https://github.com/rochus-keller/Smalltalk/
It's about a Smalltalk-80 image from 1983.
Trellis/Owl had interesting ideas, though I spent more time with Modula-3.