Erlang/Elixir nodes can actually be rather trivially clustered, you can spawn processes on other nodes and transparently pass messages to processes on other nod

Erlang/Elixir nodes can actually be rather trivially clustered, you can spawn processes on other nodes and transparently pass messages to processes on other nodes, including things like closures. It does not magically schedule workloads across the cluster, but there are libraries that can do so.