Android Things Lantern - Real-world AR with Google's new IoT platform
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Sunn - A smart light fixture that brings the changing sun indoors
ioBroker - flexible and modular application for the IoT and Smarthome
GE Sol - A bright idea for smart home, integrated with Alexa
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation