It's not perfect, but the Chamberlain myQ smart garage door opener is the best option for most people.
The GarageMate Garage Door Remote Control and App is an ultra-simple and affordable garage door opener that you control from your smartphone, but other openers such as the Chamberlain MyQ and Nexx have many more features.
While setup is a bit tricky, Garadget provides a secure way to open your garage door using your smartphone.
The Nexx Garage smart garage door opener offers a solid array of useful features with loads of functionality built into the app, once you can get through a frustrating setup process.
The Nest Thermostat E is an attractive and relatively affordable smart thermostat, and it's also one of the easiest to use.
The Bosch BCC100 is an attractive and relatively affordable smart thermostat, but its interface could be more intuitive.