edX - Best Courses. Top Institutions. Learn anytime, anywhere.
Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
Treehouse - Treehouse is an award-winning online platform that teaches people how to code.
Mentimeter - a web-based polling tool for workshops, conferences & events
Geocities Site Builder - Share your abomination with the world
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.