Tado - a smart thermostat, sets the temperature while we're in the house. Heats up water only if we're in. Uses an app to geolocate us.
Lifx - lightbulbs which automatically dimm at 2300 (good reminder to go to bed) and auto switch off a couple of hours after sunrise.
Everything else is either always on (security cameras, smoke detector) or run as needed (Roomba, car charger, electric blanket) or autonomous (Moixa solar battery).