Skype for Slack - Move your slack discussions to a group skype call
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Aircall Now - Make voice calls inside Intercom Messenger 📞💬
ioBroker - flexible and modular application for the IoT and Smarthome
Calls on Slack - Make voice calls in Slack
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation