Messenger Video Calls - Facebook Messenger, now with HD video calls
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
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.
Missive - Team communication app now supporting FB, Twitter & SMS
CallKite - Your website’s video call center in just one click.
Front - The platform for exceptional customer service at scale.