Senatus - Upvote for questions around a given topic.
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.
Hypersay Slides - The next generation interactive presentation tool
Bigo Live - #1 Live Streaming App in the world
Eventee - Eventee is the most beautiful and easy-to-use mobile event app for attendees.
Lexsury - Activate your audience with a Lexsur: the easiest way to setup your next speaking event with...