[tdondich]

I'm the CTO at ProcessMaker and so I might be a little biased. Our customers use our ProcessMaker BPM product if the workflows require human intervention through forms/email other interactions. The reporting tools assist in monitoring and dealing with circular chains.

If you are a developer and want to develop your own system around a workflow engine, we also have www.processmaker.io which is a workflow engine in the cloud. So all the infrastructure hassle is taken care of for you and you communicate via an api to build out your workflows and execute them. I feel like that's better described as an orchestration engine however it supports task assignment to people. An approach like this works well with microservices since it can act as a microservice orchestration engine with a more human workflow approach.

Both of these approaches can be long running (some customers have year long processes running).

Let me know if you want to know more details, happy to share.