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.
Daily.co for Intercom - Free video calls & screen shares embedded in Intercom
Face to Face - Video meetups for online communities (PH room password meow)
Pluot Communications - Big-screen video conferencing for startups
Skype for Slack - Move your slack discussions to a group skype call
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.