Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Whiteboard for Skype Interviews - Skype brings a whiteboard to Skype Interviews
ioBroker - flexible and modular application for the IoT and Smarthome
YouOgle - Drop-in video chat app
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation