Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Yeelight - Yeelight is the ultimate remote control for all your smart lights to turn them on and off without having to press a physical button on the switchboard.
ioBroker - flexible and modular application for the IoT and Smarthome
Lightmeter - Postfix monitoring and problem resolution
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
MijiaTemp - MijiaTemp app contains features to allow users to get real-time information about the temperature, humidity level, moisture level, and battery level using a lock screen widget.