Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Yac - Take your time back from Zoom & Slack
ioBroker - flexible and modular application for the IoT and Smarthome
Beseda - Async video and audio messaging for remote teams
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
SuperNormal - Async video updates for remote teams