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FOSS Language Learning
(beehaw.org)
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.
I will definitely be considering LWT when I look for apps to self-host once I move out of my current place (long story). Might even look into developing a better UI if I get the time.