There are a few tools out there like Elsa and Microsoft Rules Engine that stay in the backend, but are still fairly rudimentary in nature. So far as I know there's no "plotly" or similar A-tier framework that solves this problem for workflow. Most groups that have done it instantly monetize it with their own front end (Asana, Monday.com, etc.) which makes it difficult to justify the effort to integrate if you are going for a lighter weight application. Hope that helps clarify!