re driver there are several. I think Bett’s is the best out there at the moment (you can find conversations about it in the community)
But I am working with someone who is developing the MQTT connection which I think will be a better implementation because it does a lot more than just tasmota.
I already have it working on a range of different things including a shelly 4pro (which you cant flash with custom f/w; an noone was able to write a good device handler for!).
We’ve also been playing with custom devices on an ESP8266.
Anything that talks MQTT we can connect to it! you then just write a device handler for it.