PingPong is a student response system that I recently learned about from Danny Nicholson. Like many similar systems PingPong provides you with a free and easy way to collect feedback from students in the forms of multiple choice, true/false, and short answer questions. PingPong also lets you collect sketches from students which is a great way to have students illustrate solutions to mathematics problems or to submit diagrams to answer a question.
To start an activity on PingPong you need to create an account, but your students do not have to create accounts. Once you've created a PingPong account you can begin an activity by clicking "start PingPong" in your admin panel. Then select the type of activity that you want to run. You can run a multiple choice, true/false, short answer, or image response activity. Image response will let students draw a response to your prompt.
Students participate in your PingPong activity by going to gogopp.com/en/web then selecting guest and entering your room code. You can choose your own room code or use the default code that is assigned to you. Your room code is the same for all of the activities that you conduct. That could be helpful feature because once you've run a few activities your students should get the in the habit of using the same room code over and over. You could also post your PingPong room code on a board in your classroom.
Applications for Education
All PingPong activities are single question/ single prompt activities. The single question nature of PingPong makes it good for conducting a quick survey of your students' knowledge of a single concept before or after a lesson. The drawing feature makes PingPong a good option for asking questions that aren't easily answered with a typed response. PingPong offers free Android and iPad apps which make it easier than using a mouse or touch pad for students when they sketch responses to your questions.