Once you have worked tirelessly and jumped through many hoops to adopt an OER textbook in order to bring down the cost of education for your students, you may feel guilty about adding back the expense of educational tools such as immediate responseware, also known as instant polling. However, there is strong research evidence that immediate responseware is a successful engagement strategy that promotes active learning and fosters a supportive, inclusive classroom when used with low-stakes assignments or to gauge transfer of knowledge. The traditional approach is for students to purchase a physical device or license through an educational technology provider such as TurningPoint or i-Clickers. The cost of these traditional services has been increasing, adding to the financial burden for our students in the midst of an ongoing global economic recession. An alternative approach is for an instructor to use a free or low-cost mobile app for student participation. In this session, we will demonstrate an array of free apps that we have used in various courses, present examples of how they can be implemented in different types of classes, and discuss the benefits and limitations of each.