Kahoot! - Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
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.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Mentimeter - a web-based polling tool for workshops, conferences & events
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.