wat-js VS wekan-node20

Well Forth is possibly the most minimal VM over a platform, as evidenced by openfirmware.

It does have problems scaling though, in that if you've seen one Forth, you've seen one Forth ie. The variations required to fit a platform make them semi-incompatible.

That's not to say that a more lispy Forth wouldn't be useful though, in that a concatenative syntax allows us to pass custom datastructures around like APL, and CPS (delimited continuations with lexically scoped dynamic binding would come from the lisp side (see https://github.com/manuel/wat-js).

Memory management in Forth can handle multiple memory types eg. https://flashforth.com/ so adding something like ref counting (https://github.com/zigalenarcic/minilisp/blob/main/main.c) to handle the dynamic list side of things might mesh well.

In any case, if you're looking for a self hosting lisp that runs on bare metal, https://github.com/attila-lendvai/maru has been out for a few years.

https://github.com/manuel/wat-js

If you have delimited continuations then you can construct coroutines/threads/await/async, promises etc.

I guess that this might be suitable for many scenarios thanks to nodejs, but the runtimes it relies on are not exactly small.

Rust/Zig does not have enough portability, there is errors trying to compile to s390x:

https://github.com/wekan/wekan-node20#trying-to-compile-llvm...

C89 compiles to 30+ CPU/OS:

https://github.com/xet7/darkesthour