Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Wake N Shake Alarm Clock - Wake up with a jolt of energy ready to get shit done.
ioBroker - flexible and modular application for the IoT and Smarthome
Alarmy - World's most annoying alarm app
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Wakefy - Turn your Mac into a Spotify alarm clock.