The two languages that come to /my/ mind are Erlang and Go. Other programmers might have different choices. There's no reason you couldn't use a language that

The two languages that come to /my/ mind are Erlang and Go. Other programmers might have different choices. There's no reason you couldn't use a language that has threads to implement the N threads with event queues model, or something similar for that language if it has shared memory. If the language of choice lacks it you might be able to use a similar multi-process (externally) load-balanced model.