DomotiGa is an open source home automation application that helps users to control, monitor and automate their home environment. It is designed to provide an easy-to-use, yet powerful interface to control various devices such as lights, doors, blinds, window shutters, door locks, security systems, climate control and more. DomotiGa also has the ability to integrate with other systems such as Amazon Alexa, Google Home, IFTTT and more. It is a great way for users to conveniently control their home environment from anywhere in the world.
Try it and you'll understand why this is the easiest way to control your home. Nothing else even comes close (and I've seen it)!
Google Home does not have as much hardware compatibility, flexibility or expandability (it is not open source).