Daily.co for Intercom - Free video calls & screen shares embedded in Intercom
Meet Slack - Generate instant Google Meets by using /meet from any Slack channel, group or DM. Metings open with the correct Google Account and you Slack status updates to 'On a call' automatically.
Pluot Communications - Big-screen video conferencing for startups
Slack - A messaging app for teams who see through the Earth!
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.
Calls on Slack - Make voice calls in Slack