Streaks - The to-do list that helps you form good habits.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Taskful - Deadlines, meet your match.
ioBroker - flexible and modular application for the IoT and Smarthome
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation