OpenBoard - The OpenBoard software is an interactive white board software.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Surface Studio - A brilliant screen for your ideas, from Microsoft
ioBroker - flexible and modular application for the IoT and Smarthome
Twiddla - Mark up websites, graphics, and photos, or start brainstorming on a blank canvas.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation