Socrative is a free student response system that works on any device. With its built-in quick questions and quiz options, it is an incredible resource for formative and summative assessments. However, Socrative can be used for more than just quizzes.

Source: http://www.freetech4teachers.com/2015/07/beyond-assessment-3-other-uses-for.html#.Va5YI_DixY5.twitter