From Free and Open Works!
|African Storybook||Says it has stories from 128 languages, but doesn't seem to have a full list.|
|Free Culture Guide|
|Letters for Black Lives|
|Pepper&Carrot||As at October 2015. See http://www.peppercarrot.com/article267/how-to-add-a-translation-or-a-correction#status for current languages|
|Wikipedia||The current list is here: https://en.wikipedia.org/wiki/List_of_Wikipedias|