I did something similar back in the 90s. Basically implemented full state machine engine including nesting, graphical editor and debugger with the ability to ho

I did something similar back in the 90s. Basically implemented full state machine engine including nesting, graphical editor and debugger with the ability to hook custom actions. It was marketed as business process server. It was a product that was used to integrate various business processes in multiple orgs in telecom industry.