Flashcards can be virtual (part of a flashcard software), or physical. Quizlet allows users to create flashcard sets that are always available to study. Anki is a free and open-source flashcard program that utilizes spaced repetition. OpenCards uses PowerPoint ppt-files as flashcard sets. The freeware version uses a flashcard software system. Those R4i are clones for Gateway 3DS, the first 3DS flashcard for Nintendo 3DS. Gateway3DS is the first 3DS flashcard for Nintendo 3DS. Historically the most successful types of study software include mindmapping and flashcard software programs. OpenCards is a free spaced repetition flashcard program. However, there are several 3DS firmware releases which block flashcard usage. The learners try to recall the solution written on a flashcard. Fresh Memory is a spaced repetition flashcard application, similar to SuperMemo. This page contains a list of flashcard software. See full list of flashcard software. In 2009, the government of Japan outlawed the sales of the R4 flashcard.