Free and Open Source Software

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Free Software Organizations
Free software movement
Free Software Foundation
GNU Project
FOSS Philosophy
Free software
Open-source software
Free and open source software
Open Operating Systems
Unix
Unix-like
Linux kernel
Linux
GNU
Berkeley Software Distribution
Graphical User Interfaces (GUIs)
GNOME
KDE
Xfce
LXDE
Open Source and Proprietary Policies
Proprietary software
GNU General Public License
GNU Lesser General Public License
Copyleft
BSD licenses
Appendix
List of Linux distributions