http://www.okawix.com/
Okawix lets you download the whole content of Wikipedia, with or without
images, so that you can browse it offline:
Okawix is available in
253 languages and includes sister projects of the Wikimedia Foundation
(Wikisource, Wiktionary, Wikiquote, Wikibooks).
Okawix is a free software available under GPL licence;
~prinson