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