Ran a bunch before I moved, just starting to do it again at the new place. Sprinkler control, thermostat, multiple rooms with temperature, humidity, motion and light sensors, smart plugs and switches (commercial but hacked firmware), frigid/freezer door/temperature monitor and I forget what else. All local, MQTT to Node Red with a pinhole to the internet for web page monitoring/access. Oh yeah, and doorbell and mailbox monitoring.