I found this discussion while doing research on test automation framework. There is an open source project for test automation that I also found while researching called OpenTAP. It is an open-source test sequencer that is well document and has a pretty decent community. Its extendable and has a .NET core. There is another one called OpenHTF that was created by some Google engineers that is a Python test framework, but it has limited documentation. I don't know if this helps because I have limited software and testing knowledge, but this is what I've found.