By now, most faculty members and students are familiar with “clickers” or other devices and apps used to collect responses to questions in real-time. Once relegated to talk shows and advertising focus groups, and then to very large university lecture halls, these tools are now finding a home in even small classes for quizzes, ungraded reviews, anonymous polling, and prompting in-depth discussion. When used effectively, clickers and polling apps can significantly contribute to active and rigorous learning. When used poorly, their initial novelty wears off quickly, leaving students bored and frustrated. The following resources have been selected to help you get started or improve your use of clickers or polling apps in the classroom.