Full text of Peter Wayner's book, subtitled "How Linux and the Free Software Movement Undercut the High-Tech Titans". [PDF]
The full text of this O'Reilly book has been made freely available online.
Book by Karl Fogel. Full text freely available as HTML, PDF, and XML.
The authors of several open source applications explain how their software is structured, and why. Full text under the Creative Commons Attribution license.
All-encompassing book on using open source software, which itself is open source and available online.
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