Launch Clock - Set a launch date for your startup and stick to it
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
E.ggtimer.com - A simple countdown timer with an alarm for the browser.
ioBroker - flexible and modular application for the IoT and Smarthome
Departure - Your website launch checklist
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation