Cardkiwi is a great site for creating digital flashcards that I just found out about from Free Technology 4 Teachers. This is a nice site for creating online flashcards that allows users to rate them. The benefit of this is that Cardwiki then uses a system called "spaced repetition" that differentiates instruction by showing cards that a user needs help w/. The way this works is a user clicks a thumbs up/down to determine if they know a flashcard. The cards they need help w/ will appear more often when they are studying.
I highly recommend checking out Cardwiki by clicking here!!!
Below is a brief demo...
