I'm looking for a BYOD (Bring Your Own Device) student response system (like Socrative, Top Hat, Learning Catalytics, Pingo, etc.) with the following three properties:
- It is free for both the instructor and students.
- It can display mathematical formulas.
- Students register and sign in individually, so that it can be used to track attendance/participation or give graded quizzes.
Is there such a thing?