His was one of the first (if not the first?) computerized SRS (spaced repetition systems) out there (flash cards methods existed, such as the Lietner box system). It's non-free though. There are several more modern alternatives out there. Most people I know (who are into SRS programs) use Anki: www.ankisrs.net
You can even download pre-made decks from within the app (it's something like File->download->shared deck) that other people have made available for all kinds of topics (heavy emphasis on foreign languages).
You can even download pre-made decks from within the app (it's something like File->download->shared deck) that other people have made available for all kinds of topics (heavy emphasis on foreign languages).