Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Messenger Video Calls - Facebook Messenger, now with HD video calls
Crisp Chat - Multi-channel customer support software
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.
FLEX - An in-app debugging and exploration tool for iOS.
CallKite - Your website’s video call center in just one click.