Language/Multiple-languages/Culture/Ideas-about-language-learning
This is for expressing your ideas about language learning and culture exchange.
Everyone may say something under its username. And generally do not delete other users' content.
GrimPixel
Website of visual dictionary
I have seen three books:
5 Language Visual Dictionary
The Firefly Five Language Visual Dictionary: English, Spanish, French, German, Italian
Merriam-Webster's Compact 5-Language Visual Dictionary (English, Spanish, French, German and Italian Edition)
So I think there can be a website can provide such a service, even better. Better if it is well-funded and be free of charge. I don't expect Duolingo to do that, at least before it makes its new courses acceptable.
Tutorials of languages
I have seen two channels on Youtube:
https://www.youtube.com/user/ProgrammingKnowledge
https://www.youtube.com/channel/UCfx2dro_w4_MyA19Nm5badg
providing "tutorials" about programming languages such as C++, Java, Python, which last several hours. So I think somebody may give such "tutorials" about the grammar of human languages.
Filter of characteristics
This requires a database of characteristics of ethnics or nationalities, with a filter. Input the characteristics, and get the result of which ethnics or nationalities possess them.
Of course it requires update, because culture may change with time.
Sentence analyzer
Tatoeba has a lot of sentences, but it only shows what a sentence looks like. There should be something radical, to reveal the function of a sentence, to show people the logicality of a sentence.
I imagine a service, which draws parse trees of each sentence, and shows how a sentence may be changed in structure into another one without changing its general meaning.