Cozi - Cozi | Must-have app for the modern family
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Google Calendar - Spend less time managing your day & more time enjoying it
ioBroker - flexible and modular application for the IoT and Smarthome
WAVE Calendar - WAVE Calendar is a revolutionary app, which is designed to bring balance to your life
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation