Wikibooks is a wiki-based Wikimedia project hosted by the Wikimedia Foundation for the creation of free content textbooks and annotated texts that anyone can edit. In June 2016, Compete. com estimated that Wikibooks had 1,478,812 unique visitors, the wikibooks. org domain was registered on July 19,2003, and launched to host and build free textbooks on subjects such as organic chemistry and physics. In August 2006, Wikiversity became an independent Wikimedia Foundation project, Wikijunior is a subproject of Wikibooks that specializes in books for children. The project consists of both a magazine and a website, and is currently being developed in English, Danish, Finnish, French, German, Italian, Japanese, Spanish and it is funded by a grant from the Beck Foundation. While some books are original, others began as text copied over from other sources of free content textbooks found on the Internet, all of the sites content is released under a Creative Commons Attribution-Share Alike license. The project is working towards completion of textbooks on numerous subjects, cK-12 Foundation Digital library e-book European Library Free High School Science Texts Global Text ibiblio LibriVox, an online digital library of free public domain audiobooks. Open Content Alliance Project Gutenberg Universal library Wikibooks, What is Wikibooks, all Systems Go, The Newly Emerging Infrastructure to Support Free Books. An Interview with Curtis Bonk, A Look at Wikibooks and Wikibookians, English Wikibooks Main Page Wikijunior Main Page Wikibooks multilingual portal Wikibooks Language Editions, list of Wikibooks for various languages ordered by size. Wikibooks page on Meta-Wiki Wikibooks takes on textbook industry
Detail of the Wikibooks main page. All major Wikibooks projects are listed by number of articles.
Growth of the eight largest Wikibooks sites (by language), July 2003–Jan 2010