Other than with like a PDF of a textbook (or a physical version thereof), I don't know many FOSS apps/sites for learning a language whether its a fringe language with few resources like Te Reo Māori, Irish, or Georgian or a major language like German, French, or Spanish. Have y'all seen any sites or apps for this?
Edit: I am already aware of Anki, although I don't think it alone is enough for me (plus I can get unmotivated to do the cards for a day and then I have to play catch up)
I have looked at Anki before and I am familiar with it. I have a few decks on there, one for German via Nicos Weg and another for Japanese Kanji Radicals via Wanikani (I think that's what it's called). I suppose re "fringe" languages, it's only as good as the decks, and there might be some out there for them.
Anyway, I feel like Anki alone isn't enough for me. I can sometimes get a little demotivated to study for a day or two and then I'm set back in my studies (or at least I feel that way).