We're in the same boat. We need to have workflow management for some fairly simple workflows that are headed by some sort of work queue system and router that can select the appropriate workflow for the type of work needed (user submits a request, it gets appropriately queued, then processors manage the requests following a prescribed workflow for the type of request). The key for us is that some of the workflows are long-running (days to weeks) as the processors handle some manual tasks related to the steps.

I've (so far) looked at Elsa and OptimaJet. The latter seems like it's heavier than we need, but this is the first use of a workflow engine here, and the idea may gain traction. We're a state government agency, so that comes with a certain amount of decision-making baggage associated with it.

Thanks for the overview of the other systems available, it's helpful.