| Omarchy | David Heinemeier Hansson | — | MIT License |
| OpenBSD | OpenBSD Project, Theo de Raadt | — | ISC license |
| OpenDarwin | — | 2002 | — |
| Parch Linux | — | — | GNU General Public License |
| Pop!_OS | System76 | 2017 | GNU General Public License |
| Q4OS | — | 2013 | GNU General Public License |
| RavynOS | — | — | — |
| ReactOS | Amine Khaldi, Timo Kreuzer, Eric Kohl, Hermès Bélusca-Maïto, Cameron Gutman | — | GNU Lesser General Public License, GNU General Public License |
| Redox | Jeremy Soller | — | MIT License |
| REMnux | Lenny Zeltser | — | — |
| Replicant | — | — | Apache Software License 2.0, GNU General Public License, version 2.0 |
| Rocky Linux | Rocky Enterprise Software Foundation | — | 3-clause BSD License |
| RT-Thread | — | — | Apache Software License 2.0 |
| SambaEdu | — | — | GNU General Public License |
| ShredOS | — | — | GNU General Public License, version 2.0 |
| Siduction | — | 2011 | GNU General Public License |
| Stali | Anselm R. Garbe | — | — |
| Tails | The Tor Project, Inc | 2009 | GNU General Public License v3.0 or later |
| TrueOS | IXsystems, Kris Moore | 2006 | BSD licenses |
| Ubuntu | Canonical Ltd. | 2004 | — |
| Ubuntu Cinnamon | — | — | — |
| Ubuntu Unity | — | 2020 | — |
| Ultramarine Linux | — | — | — |
| Ututo | — | — | GNU General Public License |
| Xubuntu | Canonical Ltd., Ubuntu Foundation | 2006 | — |
| Zephix | — | — | — |
| Zephyr | Wind River Systems, Linux Foundation | — | Apache Software License 2.0 |
| Zorin OS | Zorin Technology Group Ltd. | 2009 | GNU General Public License |