Socrative is a great way to get real-time responses and assessment from anyone with a computer, smartphone or other mobile devices. It gets its name from the Socratic Method and is a great way to engage students in the classroom or lecture hall.
Socrative 2.0 is coming out Monday, October 7, 2013. This new version will include student quiz navigation, which allows them to skip questions and move to any question in student-paced quizzes, and the ability to include images in any multiple choice or short answer questions.
I am looking forward to participating in their Fall Partnership Program, providing detailed monthly feedback and being a part of forming this up-and-coming student response system.
There is an app for teachers and a separate app for students for iOS.