http://en.wikibooks.org/wiki/FLOSS_Concept_Booklet
http://en.wikipedia.org/wiki/Comparison_of_open_source_and_closed_source
http://en.wikipedia.org/wiki/Comparison_of_Windows_and_Linux
http://www.gnu.org/software/reliability.html
http://www.gnu.org/philosophy/schools.html
http://www.gnu.org/philosophy/your-freedom-needs-free-software.html