Mirror - The mirror that's also an interactive home gym
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Todayist - Your friendly "have a great day" planning app
ioBroker - flexible and modular application for the IoT and Smarthome
CUJO - Smart firewall for your connected home
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation