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
Bunch - Bunch is a simple web dashboard that integrates with your teams' calendars.
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.
Booyah - Video chat with up to 12 friends at the same time.