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.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
ioBroker - flexible and modular application for the IoT and Smarthome
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation