Words lists

All words in all languages:

https://github.com/eymenefealtun/all-words-in-all-languages

Words by frequency:

https://github.com/oprogramador/most-common-words-by-language

Google n-grams:

https://books.google.com/ngrams/info

Corpus from Beatuful Data

https://norvig.com/ngrams/

Lang iso codes:

https://en.wikipedia.org/wiki/List_of_ISO_639_language_codes