Anybody know a Linux and/or Android flashcard program with a documented format for the flashcards? (json, html, xml, whatever...)

I need to be able to write a script to generate the cards. I have several directories full of stuff to be put on flashcards but I don't want to create hundreds/thousands of cards manually. Computers exist to do my tedious work for me so "easily create cards by dragging and dropping" isn't actually appealing....

Thanks in advance! 😀