I've got my Alexa and also can access Alexa on my FireTV. I've got the SmartThings hub that connect my motion, temperature, floor and door sensors. I've also got Osram light hub for the smart bubs, some indoor and out.
Also Harmony Hub to control my entertainment system. Finally, I have BlinkForHome for my indoor cameras and Ecobee3 for Thermosthat. Everything I've listed operates off timers, sensors or time of day. If leave the house, it knows to turn everything off. They all can be controlled from my phone or Alexa. Right now, adding more stuff has taken a backseat but I'd like to add a smart door lock next