Flippity.net is a series of web apps called FlipCards, created by Steve Fortna, that can easily turn a google spreadsheet into a set of online Flashcards or Quiz Show. There are cards for helping a teacher create random groups, or mix and match activities. Students accomplishments can be tracked using the Badge Tracker and the Certificate Quiz FlipCard. There is even a Spelling Words FlipCard that can read the word to you. I partnered up with Steve to create the add-on as an easier way for users to setup Flippity FlipCards.