Books

Free for All - Full text of Peter Wayner's book, subtitled "How Linux and the Free Software Movement Undercut the High-Tech Titans". [PDF]
www.wayner.org/books/ffa/

The Linux Cookbook - All-encompassing book on using open source software, which itself is open source and available online.
dsl.org/cookbook/

Open Sources: Voices from the Open Source Revolution - The full text of this O'Reilly book has been made freely available online.
www.oreilly.com/catalog/opensources/book/toc.html

Perspectives on Free and Open Source Software - Book edited by Joseph Feller, Brian Fitzgerald, Scott A. Hissam and Karim R. Lakhani. Site includes full text as PDF downloads of each chapter.
mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=11216

Producing Open Source Software - How to Run a Successful Free Software Project - Book by Karl Fogel. Full text freely available as HTML, PDF, and XML.
producingoss.com/