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This app lets students with Internet access input answers for formative and summative assessments. Instructors can easily transform their existing assessments into paperless exams so test results can be saved in an organized manner. The Go Interactive feature helps instructors gather information about student understanding at any point during a lesson. Some instructors use it as a "clicker"-like system, but the app is meant primarily for creating tests and providing feedback.
The free, cloud-based version accommodates up to eight classes of 200 students total. Even the free version is robust, so give it a try!