| /e/OS | Gaël Duval, E Foundation | 2018 | MIT License, Apache Software License 2.0 |
| A2 | ETH Zurich, Niklaus Wirth | — | BSD licenses |
| Alpine Linux | — | — | 2-clause BSD License, GNU General Public License, version 2.0, MIT License |
| Android | Google | — | Apache Software License 2.0, GNU General Public License, version 2.0 |
| Android 16 | Google, Open Handset Alliance | — | — |
| Android 17 | Android Jetpack, Open Handset Alliance | — | — |
| Android KitKat | Open Handset Alliance, Google | — | Apache License, GNU General Public License |
| Android Marshmallow | Open Handset Alliance, Google | — | free software, Android Open Source Project |
| AOKP | George Merlocco | — | Apache License |
| Arch Linux | Allan McRae, Anatol Pomozov, Aaron Griffin, Felix Yan | 2002 | GNU General Public License |
| ArkOS | — | — | GNU General Public License |
| Armbian Linux | — | — | GNU General Public License, version 3.0 |
| AROS Research Operating System | — | — | AROS Public License |
| Astra Linux | RusBITech | — | GNU General Public License |
| Bada | Samsung Electronics | — | proprietary license |
| Barrelfish | — | — | MIT License |
| BeOS | Be Inc., Jean-Louis Gassée, Cyril Meurillon, Jean-Baptiste Maurice Quéru, Benoit Schillings, Dominic Giampaolo, Steve Sakoman | — | proprietary license |
| BlackBerry 10 | BlackBerry | — | proprietary license |
| CentOS | — | 2004 | GNU General Public License |
| China Operating System | — | — | — |
| ChorusOS | Chorus Systèmes, Oracle Corporation, Sun Microsystems, Institut National de Recherche en Informatique et en Automatique | — | BSD licenses, GNU Lesser General Public License, Mozilla Public License, Sun Public License |
| ChromeOS | Google | — | proprietary license |
| ChromiumOS | Google | 2009 | BSD licenses |
| CyanogenMod | CYNGN Inc. | 2009 | Android Open Source Project, Apache License, GNU General Public License |
| Darwin | Apple Inc. | 2000 | Apple Public Source License |
| Debian | The Debian Project | 1993 | GNU General Public License |
| Dirty Unicorns | — | 2012 | GNU General Public License, version 2.0, GNU General Public License, version 3.0 |
| ELinOS | SYSGO | — | GNU General Public License |
| Embox | — | — | 2-clause BSD License |
| EndeavourOS | — | 2019 | — |
| Exherbo | — | — | — |
| Fedora Linux | Red Hat, IBM, Fedora Project | 2003 | MIT License |
| Fire OS | Amazon | 2011 | GNU General Public License, Apache License |
| Firefox OS | Mozilla Foundation, Mozilla Corporation | — | Mozilla Public License, Apache License, free license |
| Flyme | Meizu | — | GNU General Public License, Apache License |
| FreeBSD | — | 1993 | 2-clause BSD License |
| FreedomBox | — | — | GNU Affero General Public License, version 3.0 or later |
| FreeRTOS | — | 2003 | MIT License |
| Fuchsia | Google | — | Apache License, MIT License, 3-clause BSD License |
| Galileo | Acorn Computers | — | — |
| Gentoo Linux | — | — | GNU General Public License |
| Googlebook OS | Google DeepMind, Google | — | — |
| Halium | — | — | — |
| HarmonyOS | Huawei | 2019 | — |
| Illumos | — | — | Common Development and Distribution License version 1.0 |
| Inferno | Vita Nuova Holdings, Bell Labs | — | GNU Lesser General Public License, MIT License, GNU General Public License |
| Integrity | Green Hills Software | — | — |
| IodéOS | — | — | Apache Software License 2.0, GNU Affero General Public License, version 3.0 |