Wikibooks

A project by the Wikimedia Foundation.

A collection of open-content textbooks that anyone can edit.


 * http://en.wikibooks.org/wiki/Main_Page (english)
 * http://de.wikibooks.org/wiki/Main_Page (german)
 * http://en.wikibooks.org/wiki/Wikibooks_portal (other languages)

Related: Wikimedia,Wikipedia,Project Gutenberg