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Michael Nielsen and Andy Matuschak wrote Quantum Country (https://quantum.country/), an introduction to quantum mechanics, with integrated spaced repetition questions. Andy develops Orbit (https://withorbit.com/), allowing other authors to do the same.

I agree with Michael that a lot of the value comes from formulating your own questions based on the source material, but I'm also curious to experiment with author provided questions.

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In my humble experience, you gain a LOT from writing the questions yourself, I point that I'm not sure if the author is stressing enough.

There's also the problem with cards that are difficult to memorize, which is something that you don't know in advance, and that's a good thing! It shows you were you should pay more attention, write cards in different forms, etc.

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