I would like to learn a couple of languages (polish and Japanese - I already learned Spanish to a decent degree) but it seems like every solution is closed source.
I would use books but listening (and speaking) are very important and books won’t help with those.
What would you guys recommend?
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There is librelingo but, honestly, it’s far behind Duolingo.
The closest software I found is to use a flashcard tool (like AnkiDroid) and then search for an open deck of your language using AnkiWeb.
Doing so you get a similar experience than DuoLingo without the gamification and pretty UI.
I can’t recommend Language Transfer highly enough! It’s completely free too.