Interesting set of tools that you can use to check understanding of students during lesson.
Includes Polls, formative quizzes, (understanding) barometer, discussion area, Q&A feature.
Free for up to 30 students at a time. Students join an “event” and then post responses which can be read in real time. Student responses can be made anonymous too.
Used in the right circumstances this could be a very powerful tool used during the lesson. Might even work for an OFSTED progress observation if you are brave enough :o)
SlideShare explaining key features: http://www.slideshare.net/gosoapbox/getting-started-with-gosoapbox-25965556?ref=https://app.gosoapbox.com/account/getting_started