Simply Piano - Fast and fun way to learn piano
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
ioBroker - flexible and modular application for the IoT and Smarthome
Yousician - Learn to play music at home, at your own pace
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation