DirectPoll
DirectPoll offers a real-time voting service for big audiences. This tool is also very useful for second screen scenarios or modern learning in a flipped classroom. The service, currently offered for free, is highly scalable and very flexible. A poll is setup in minutes and may be altered at any time. DirectPoll has a strong focus on live events. The votes are animated while they happen. No extra hardware is needed in order to steer a poll, all voters simply use their smartphone. The presenter may edit the questions at any time, even if a poll is running.