I wanted to know the same thing so this is what my searching has brought up, specifically for Scots Gaelic as that’s what I’ve been learning.
Speak Gaelic - Gaelic only, government funded, free
IndyLan - for endangered European languages, made by Heriot-Watt University and EU funded, free
Mango Languages - appears to be the closest to a Duolingo replacement. Many languages, subscription.
Glossika - another Duo replacement however that URL doesn’t fill me with confidence that they’re not going down the same route… Subscription for most languages, endangered ones are free.
Apart from the first Mango lesson for free and a few IndyLan lessons I’ve not tried any of these so can’t speak for their quality but thought a list might still be handy.
I wanted to know the same thing so this is what my searching has brought up, specifically for Scots Gaelic as that’s what I’ve been learning.
Speak Gaelic - Gaelic only, government funded, free
IndyLan - for endangered European languages, made by Heriot-Watt University and EU funded, free
Mango Languages - appears to be the closest to a Duolingo replacement. Many languages, subscription.
Glossika - another Duo replacement however that URL doesn’t fill me with confidence that they’re not going down the same route… Subscription for most languages, endangered ones are free.
Apart from the first Mango lesson for free and a few IndyLan lessons I’ve not tried any of these so can’t speak for their quality but thought a list might still be handy.
HelloChinese for Mandarin
Mango is really good and you might be able to use it for free with your library card if you’re in the US!