WikiBooks and WikiSource

WikiBooks and WikiSource: Wikipedia's Free collections of textbooks. "Wikibooks went online on 10 July 2003, and there are 22,403 modules currently on the site." ..."Wikibooks differs from Wikisource because content on Wikibooks is expected to be significantly changed by participants. Raw source documents such as the original text of Shakespearian plays is hosted on Wikisource instead."..."Wikisource collects and stores in digital format previously published texts; including novels, non-fiction works, letters, speeches, constitutional and historical documents, laws and a range of other documents. All texts collected are free of copyright, either because this has expired or because the text has been released under a GNU Free Documentation License."