Socrative – A smart student response system that empowers teachers to engage their classrooms through a series of educational exercises and games via smartphones, laptops, and tablets. Watch the video to learn more. http://vimeo.com/socrative/intro
Poll Everywhere - Instant audience feedback - Free online tool that gathers live responses in any venue. Teachers are allowed as many sessions as they like. Up to 75 participants allowed to respond in each session.
AnswerGarden – Use it in the classroom as a brainstorming tool or you can embed it on your website/blog to use as a poll or guestbook.
Pollmo – No account or sign up required – create a new poll in just three easy steps.