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Language learning app?
(lemmy.ca)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
There's really nothing worth spending your time with for verbal language learning when it comes to free and open source software. In fact, most software isn't worth your time.
iTalki can be good for finding you a tutor and having video chats.
Pimsleur is good for solo instruction and practice.
YouTube is good for tips from other language learners and finding immersive content (i.e. content from native speackers in another language).
None of this is libre software.
I've actually had great success with Rosetta Stone (not free in either way), but YMMV.