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One of my favorite workflow engines that has a really simple way to do things was not listed here, so I'll call it out - Netflix Conductor (https://github.com/Netflix/conductor).
Its capabilities comes to light when you model really complex workflows and one real value is how its all very visual not just during modeling but when running it. The history remains visible and you can even see how the whole flow evolved.
The article is quite thorough and I enjoyed it as it reminded me of my forays in the domain. One nook in this domain, I never managed to investigate in the depth I would like is the Kinetic Rules Language [0] which makes the connection to complex event processing more pronounced.
CEP is not trendy, which is probably because of history and traditional implementations but I think it deserves a good look.
[0] https://github.com/Picolab/pico-engine is an implementation of the KRL