Classmint is a free, online flashcard service. Like all of the services similar to it, Classmint can be used to create and share sets of flashcards. One aspect of Classmint that makes it slightly different from some other flashcard tools is that Classmint will read your flashcards to you. Classmint also supports the use of images in your flashcards.
Applications for Education
As I've said for years, I don't make high school students create flashcards as an assignment, they just seem to show up with them. Services like Classmint could be useful to students who like to use flashcards as a method of reviewing before a test. The option to share sets of flashcards does make Classmint a fine option for students who want to help each other create review materials.