Daily.co for Intercom - Free video calls & screen shares embedded in Intercom
Houseparty - Brining empathy to online communication.
Pluot Communications - Big-screen video conferencing for startups
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
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.
Rume - Video chat that doesn't feel like work