Wikibooks — Foreign Language Resources

Wikibooks is a collaborative, open content project. Authors around the world participate in creating books in many different languages and genres. For example,  there are thousands of pages written in English, French, Italian etc.

and hundreds of pages in languages such as Arabic,  Farsi, Norsk, Simple English, Tagalog and Turkish.

While there are several other sub projects of note (Wikijunior — books for children, Simple English — materials on various topics) because of the uneven level of coverage at this point, the Wikibooks is most useful for the foreign language resources.