What: Quick/Easy site to Create/Give Quizzes
Website/URL: Quizizz - http://www.quizizz.com/
Cost: Free
Why: Great Site for quick assessment!
When I say quick , I mean literally it might take you 10 minutes to create a quiz, assign it and have the results as soon as the students have it completed. Granted, all questions are multiple choice but what a great way to give a quick assessment. This site seamlessly interfaces with Google Classroom. Assign as a quiz or homework or print it off if the students don't have a device. See the video above for a quick tutorial to get you going!
UPDATE: 5/31/2016- Now import questions from a csv! Awesome!