| EU OS | — | — | — |
| EulerOS | Huawei | — | — |
| Exherbo | — | — | — |
| ExTiX | — | — | — |
| Ez-WifiBroadcast | — | — | — |
| EZeY | — | — | GNU General Public License, version 2.0 |
| Familiar Linux | — | — | GNU General Public License |
| Fantoo | — | — | — |
| Fedora AOS | — | — | — |
| Fedora CoreOS | — | — | — |
| Fedora Legacy | — | — | — |
| Fedora Linux | Red Hat, IBM, Fedora Project | 2003 | MIT License |
| Feren OS | — | — | — |
| Fermi Linux | Fermilab | — | GNU General Public License |
| Fira OS | — | — | — |
| Fire OS | Amazon | 2011 | GNU General Public License, Apache License |
| Firefox OS | Mozilla Foundation, Mozilla Corporation | — | Mozilla Public License, Apache License, free license |
| Fli4l | — | — | GNU General Public License |
| Fluxbuntu | — | — | GNU General Public License |
| Foresight Linux | — | — | GNU General Public License |
| Fox Linux | — | — | — |
| Freeduc-cd | UNESCO | — | — |
| Freespire | Linspire | — | GNU General Public License, proprietary license |
| Freetz | Eugen Rudoy | — | GNU General Public License, version 2.0 |
| FreeWRT | — | — | GNU General Public License |
| Frugalware Linux | Miklós Vajna | — | GNU General Public License |
| Fuduntu | — | — | GNU General Public License |
| Funtoo Linux | Daniel Robbins | — | — |
| Fusion Linux | — | — | — |
| Galinux | — | — | — |
| GalliumOS | — | — | — |
| Galsoft Linux | — | — | GNU General Public License |
| Gargoyle | — | — | GNU General Public License, version 2.0 |
| Garuda OS | — | 2020 | — |
| GeckoLinux | — | 2016 | — |
| GeeXboX | — | — | GNU General Public License |
| GendBuntu | National Gendarmerie | — | — |
| Gentoo Linux | — | — | GNU General Public License |
| Gentoox | — | — | — |
| GENtOS | — | — | — |
| Geubuntu | — | — | — |
| GLinux | — | — | — |
| GNewSense | — | — | GNU General Public License |
| GNIX | — | — | — |
| GNOME OS | — | — | — |
| Gnoppix | — | — | GNU General Public License |
| GNU Guix System | GNU Project | — | free software license |
| GnuLinEx | — | — | GNU General Public License |