You might be interested in my topic, which involves, among other things, replacing the controller on my Nomad with a new controller with modular stepper driver carrier board (which so happens to have an ESP32 on board as well).
I considered the projects like this but they seem to be broken into a few categories:
- Brand new and not ready for prime time (e.g. this, g2core)
- Mature but not gaining any new features (e.g. GRBL)
- Dead (e.g. TinyG)
I’m yet to see an open-source project that is both really alive and still adding new features.
When you look at the commercial world however, there are tons of CNC controllers alive and kicking, actively maintained and with new feature development.