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I came here to say this except for Clojure. While not as pure as Haskell, it has amazing parallel programming primitives like atoms, pmap, software transactional memory, and more that are extremely easy to us relative to trying to accomplish the same thing in Java etc in my very humble opinion.

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Isn't Software Transactional Memory more for concurrency than parallel computing though?

True. People tend to lump these concepts together. I think people in general are interested in utilizing more cores and so they typically are interested in STM as well, although frankly I haven't ever used it in production systems. The rest of the parallel/concurrent tools are super useful and extremely easy to use and also know assertively that you won't have deadlocks or race conditions etc.

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