Poll Everywhere is a response system that allows students to respond to questions/polls via text, a web browser or through a mobile app (a great tool for BYOD environments). The teacher can set up polls quickly for instant classroom responses with responses displayed immediately.
Poll Everywhere features include:
Website: polleverywhere.com
Difficulty: moderate
Platform: Web, iOS, Android, Chrome Extension, and as an add-on for PowerPoint, Google Slides, and Keynote