ioBroker - flexible and modular application for the IoT and Smarthome
KreateCube - KreateCube is an online platform, helps you find the nearest architects, interior designers, and firms to plan, design, and build your project within your budget. If you are professionals, explore business leads as per your locations.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.
Domoticz - Domoticz is a lightweight Home Automation System
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation