"Many computer users tend to equate Microsoft with evil, but that is a mistake. Yes, Microsoft develops non-free software, and yes, that is evil, but Microsoft is only one company among many that do this, and it is wrong no matter who does it," said Richard Stallman, founder of the Free Software Movement, author of the GNU GPL and initial developer of the GNU OS, which is the basis of today's GNU/Linux system.
http://www.linuxinsider.com/story/7SkQDXN0YglV6n/GNU-GPL-Creator-Richard-Stallman-on-the-Meaning-of-Free.xhtml