Last year, the German Wikipedia was printed. Now, many Wikipedias worldwide – including the English Wikipedia – has given people the opportunity to compile a book of Wikipedia articles which can then be professionally printed or exported as a PDF or OpenDocument.
Wikipedia has enabled the ‘Book’ extension to MediaWiki, the content management system it [...]
Wikipedia gets books and gets printed
Wikibooks free online books
Wikibooks is a great service that collects books that are freely available. The bookshelf (aka the listing of all available categories) provides links to categories like computing (and its subcategories like Programming languages) and Humanities and in those categories descriptions and links to those books. Some categories contain subcategories that contain the links, for example the programming language main category contains lots of subcategories that contain all the various programming languages.

