>Here are a few languages/systems with default isolated heap runtimes between concurrency units: Dart's isolates, Erlang's processes, Nimrod's threads, Web Work

>Here are a few languages/systems with default isolated heap runtimes between concurrency units: Dart's isolates, Erlang's processes, Nimrod's threads, Web Workers in modern browsers. Anyone know of more? Tcl runs an interpreter per thread and communicate each other using message passing.