EnGauge is a classroom tool to personalize the large lecture experience by allowing students to actively engage with their professors, TA's and other students while providing professors a real-time gauge for student understanding. You can watch our demo video at:
http://tinyurl.com/EnGauge-app
EnGauge was developed at PennApps Spring 2014 over 36 hours. The app is written with PHP hooked up to a MySQL database. For development environment, clone into xampp/htdocs and run in localhost.