Flashcards by NKO is an excellent free iOS app that combines flashcards w/ Game Based Learning. This is a innovative easy to use educational tool that teachers and students are using to create flashcards and then use them in a variety of ways, such as: games, word search, bingo, etc etc. Best of all are the CMS (content management system) features that allows teachers to track students, download thousands of flashcard decks, create folders, share, and much more.
I highly recommend checking out Flashcards by NKO by clicking here!!!