Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
LaMetric Time - Internet-connected clock makes your space unique.
ioBroker - flexible and modular application for the IoT and Smarthome
Future - Calendar events around the clock
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Ruggie - The world’s first talking rug alarm clock