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Is there someone I can try this out for free? Are there ready made flashcards for something useful to learn?

As mentioned above, Anki and Supermemo are two free implementations. As for ready-made flashcards, here are some I made for a calculus class:

http://www.spicyelephant.com/decks/523 http://www.spicyelephant.com/decks/577 http://www.spicyelephant.com/decks/659

You probably have to register for an account if you want the site to apply supermemo-type techniques. I don't recommend using the site in the long term because it will eventually force you to register for $20.

Supermemo isn't really free - maybe you meant 'Anki & Mnemosyne'? That's the big 2 in the Free SRS space.

Right. Sorry.

You can try my free implementation here: http://flashcarddb.com. You won't be forced to pay for it to keep working.

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