Messenger Video Calls - Facebook Messenger, now with HD video calls
Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
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.
Sli.do - Slido is the ultimate Q&A and polling platform for live and virtual meetings and events. It offers interactive Q&A, live polls and insights about your audience.
Voiptime Cloud Call Center - Cloud call center & telemarketing solution
Mentimeter - a web-based polling tool for workshops, conferences & events