Learncroc
Short, playable lessons with spaced review, built from the docs you must know
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Learners pairing two less common languages get a ready Anki deck without going through English, and the vocabulary is openly licensed.
AnkiGen builds Anki vocabulary decks for a pair of languages chosen from 23. You pick the card fields and which side each sits on, watch a live preview, then download or share the deck. It runs in the browser, is MIT-licensed, and the word lists are CC BY-SA. The maker, Phil Filippak, says the vocabulary is machine-drafted and only partly reviewed, and asks for corrections.
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