See my other comment, but I wonder if someone could coordinate an open source deck using github. It would have to use a text-based flashcard deck format, and as

See my other comment, but I wonder if someone could coordinate an open source deck using github. It would have to use a text-based flashcard deck format, and as with other open source, would require some coordination to curate the deck. That said, I can see some negatives as I have read that for learning, it's generally better to construct your own flashcards.