Free Software is defined as software released under a license that follows the definition of Free Software ( http://www.gnu.org/philosophy/free-sw.html http://w

Free Software is defined as software released under a license that follows the definition of Free Software ( http://www.gnu.org/philosophy/free-sw.html http://www.gnu.org/philosophy/free-sw.html ). BSD, MIT and WTFPL are all on the list of officially verified Free Software licenses: http://www.gnu.org/licenses/license-list.html http://www.gnu.org/licenses/license-list.html and are thus "Free Software". Open Source, similarly, is defined as software released under a license that follows the definition of Open Source Software ( http://www.opensource.org/docs/osd http://www.opensource.org/docs/osd ). The OSI also has a list of approved licenses: http://www.opensource.org/licenses/alphabetical http://www.opensource.org/licenses/alphabetical