We sell Anki decks for language learning. We have decks in 8 different languages, each composed of 3 decks (Beginner, Intermediate, Advanced) containing 1000 flashcards each.
We are looking to sell Deckmill because this is a side project for us and we have other jobs we need to focus on. We spend about ~1 hour per month to run it.
The usual language learning apps.