SessionStack - Record and replay web app issues. See them the way they happened to end users.
Daily.co for Intercom - Free video calls & screen shares embedded in Intercom
Balto - Easy feedback with screenshot / videos for your beta apps
Pluot Communications - Big-screen video conferencing for startups
Video Contact Forms by Typeform - Get 10x more personal with your site's visitors from Day 1
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.