Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Stampd - A document blockchain stamping service
ioBroker - flexible and modular application for the IoT and Smarthome
iotlist - Discover the internet of things
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
The IoT List - A directory of all the best IoT resources and products.