[lawik]

There is a separate implementation for really constrained device use, called AtomVM.

There are many dead efforts to implement something like the BEAM or OTP within other ecosystems. Usually not as a VM.

[reddit_clone]

I have seen attempts at actor systems like erlang/beam's. Scala/Akka seems to have been a success?

Share nothing, green-thread/coroutines also seem popular now a days.

[lvass]

C++ Actor framework is also considerably popular, and Scylladb has their own framework which I believe does something similar.

[lamuswawir]

Foundationdb also has it's own C++ actor framework.