Apps similar to Plickers include QCMCam, which is free and open source. Other options are Class Saathi. Between them they cover Mac, Windows, Linux, Android and iPhone.
QCMCam is an application for evaluation and survey, on LAN, only with a computer and a camera (webcam or smartphone). Multiple-choice quiz where students take placards and direct them to give their answers, the camera scans the answers.
Class Saathi is a free MCQ-based learning app for Class 1 to 10 students, covering all subjects, 20 State Boards, ICSE & CBSE (NCERT). It's an exam preparation app with over 500,000 questions, created by IITians and subject matter experts.
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