NextPlane - NextPlane offers cloud-based, scalable unified communications federation service for the enterprise.
Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
Voxer - Turn your phone into a Walkie Talkie. Don't waste time on phone calls and voicemails.
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.
Sameroom - Chat interoperability-as-a-service
Mentimeter - a web-based polling tool for workshops, conferences & events