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.
Geekbot - Discover how to organise asynchronous stand up meetings in Slack and keep your team synced using Geekbot. Start your free trial today!
Quickie - 3-60 second video calls with your friends
Chili Piper - Chili Piper is an intelligent calendar for Sales teams, to book their own meetings or set appointments for other teams.
Messenger Video Calls - Facebook Messenger, now with HD video calls
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.