Free Software Foundation
The Free Software Foundation, founded in 1985, is a nonprofit with a worldwide mission to promote computer user freedom and to defend the rights of all free software users. Dedicated to promoting computer users' right to use, study, copy, modify, and redistribute computer programs, the FSF promotes the development and use of free (as in freedom) software---particularly the GNU operating system (used widely today in its GNU/Linux variant)--- and free documentation. The FSF also campaigns against threats to computer user freedom like Digital Restrictions Management (DRM) and software patents. Their web site, located at http://www.fsf.org, is an important source of information about GNU/Linux worldwide. They are headquartered in Boston, MA, USA.