Two new improved editions of the two essential books about thinking and philosophy behind GNU/Linux and other free/libre and open source software have been published → http://www.fsf.org/news/rms-newbooks
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The PDFs of the book are available for free download from here:
The Free Software Foundation (FSF) has just released in tandem the second edition of its president and founder Richard Stallman's selected essays, Free Software, Free Society, and his semi-autobiography, Free as in Freedom: Richard Stallman and the Free Software Revolution.
The PDFs of the book are available for free download from here: