Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
ioBroker - flexible and modular application for the IoT and Smarthome
Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Mi Remote controller - Mi Remote controller is a reliable free to use application that allows you to control any electric appliances with your phone.
Domoticz - Domoticz is a lightweight Home Automation System