oreilly open books project   (link)

http://www.oreilly.com/openbook/
Over the years, O'Reilly Media has published a number of "Open Books"--books with various forms of "open" copyright. The reasons for "opening" copyright, as well as the specific license agreements under which they are opened, are as varied as our authors.

Perhaps a book was outdated enough to be put out of print, yet some people still had an urgent need for the information it covered. Perhaps the author or subject of the book felt strongly that books should be published under a particular open copyright. Or maybe the book was written collectively by a particular community, as in the case of our Community Press books.