Houseparty - Brining empathy to online communication.
Google Duo - Google's answer to Facetime, high-quality video calling on iOS and Android.
Huddle - Huddle | The Enterprise Content Collaboration Platform
Tribe - Create highly targeted Twitter ad campaigns in 5 mins
WUT - Anonymously chat with friends
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.