Beefer - Serious grilling for the perfect steak
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Dutch Tub - Hot tub with wood fired heating
ioBroker - flexible and modular application for the IoT and Smarthome
Boring Company Flame Thrower - Pre-order if you can guess the password
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation