Daily.co for Intercom - Free video calls & screen shares embedded in Intercom
Google Duo - Google's answer to Facetime, high-quality video calling on iOS and Android.
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.
GoRemote - A free & simple yet powerful European based solution to go remote. Video & audio conferences, screen sharing & chat with end to end encryption. Keep your team close and productive
CallKite - Your website’s video call center in just one click.
Around - Find people to hang out with.