The Free Software Foundation (FSF) is an institution dedicated to the free flow of software. To this end it has start the GNU (GNU's Not Unix) project, a collection of widely portable software of all sorts (compilers and Un*x utilities for the most part, but some other stuff as well). You can find the relevant words from Richard Stallman, president and founder of the FSF, in the GNU Manifesto below.
More information regarding the FSF, GNU, and the GPL can be obtained at http://gnu.prep.mit.edu. Note that the source code of any GPLed software must be made available by the distributor. The GPL may also affect how you distribute your programs, or maybe not. Therefore please be sure to read section A.1 Derived work. There are usually a lot of misunderstandings concerning this topic.
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