Mobile Apps for Language Learning

Hi Everyone,

I am looking for effective free mobile applications for language learning to recommend them to my students who want to improve their English.
Personally, I have been using Duolingo for learning French, German, and a bit Spanish. But I do not find it interactive. The groups we can make on the app do not necessarily lead us to suitable communicative learners. I wonder if you by any chance know a more effective free mobile app. 

There are some sources I found like the link below. But my experience does not let me trust them. 
What would you recommend? I would be grateful.


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