* [http://www.gnu.org/philosophy/philosophy.html GNU Philosophy], hardline but worth reading.
* On that note, the [http://www.gnu.org/licenses/gpl.html GPLv3] and [http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GPLv2]. Dense legal style, but also worth reading once, to understand what free software is about
* [http://www.catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/ The Cathedral and the Bazaar], by Eric Raymond: an overview of closed-source ("cathedral") vs. open-source ("bazaar") design and participation philosophies
* [http://www.gnu.org/philosophy/philosophy.html GNU Philosophy], hardline but worth reading.
* On that note, the [http://www.gnu.org/licenses/gpl.html GPLv3] and [http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GPLv2]. Dense legal style, but also worth reading once, to understand what free software is about
* [http://www.catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/ The Cathedral and the Bazaar], by Eric Raymond: an overview of closed-source ("cathedral") vs. open-source ("bazaar") design and participation philosophies