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Org-mode has lots of hidden jewels. For example, org-drill [1]. Spaced repetition with all the flexibility of org-mode-made flashcards.

Interesting tidbit: Anki's predecessor was also an Emacs mode http://ichi2.net/flashcard/

Here is another: ReadTheOrg, ReadTheDocs style formatting with org https://github.com/fniessen/org-html-themes#readtheorg