At our house we have:
An Amazon Echo.
A Philips Hue hub with lighting in the bedroom, living room and kitchen. A command to Alexa will activate any or all of them.
A few Wemo devices. One is on the exterior light that comes on at dusk and off at 12:01am and a couple that we can control when/where needed from an app or by telling Alexa to turn them on.
A Sensi programmable thermostat from Emerson. I looked at the Nest products but didn't need the options as much since I was always home. (work from home). Now we just keep the house at a constant temperature and I use the app to monitor that everything is working correctly.
a Chamberlin MyQ garage door opener with an app that I can open from anywhere in the world (used when riding my motorcycle and on the way home)
I've got a couple of cameras but never did fully deploy those. They're boxed up in a closet. Not sure why I never put any effort towards these and they're "large" compared to the choices now.
All of these can be monitored on the road, etc and I have used IFTTT to create some recipes as well. The house is mostly automated to come on and off, cool/heat as needed and make it look like someone is home even when not. I've brought some of this into the RV by way of an Echo Dot but I have a long way to go... (I'm an electronic junkie)