| 386BSD | William Jolitz, Lynne Jolitz | 1992 | BSD licenses |
| 86-DOS | Seattle Computer Products, Tim Paterson | 1980 | — |
| A2 | ETH Zurich, Niklaus Wirth | — | BSD licenses |
| Absolute Linux | — | — | GNU General Public License |
| AgiliaLinux | — | — | — |
| Alpine Linux | — | — | 2-clause BSD License, GNU General Public License, version 2.0, MIT License |
| AmayaOS | — | 2014 | GNU General Public License, version 3.0 |
| Android | Google | — | Apache Software License 2.0, GNU General Public License, version 2.0 |
| Android KitKat | Open Handset Alliance, Google | — | Apache License, GNU General Public License |
| Android Marshmallow | Open Handset Alliance, Google | — | free software, Android Open Source Project |
| Armed Forces mobile system | — | — | proprietary license |
| AROS Research Operating System | — | — | AROS Public License |
| AtheOS | Kurt Skauen | — | GNU General Public License |
| Aurora | — | — | GNU General Public License |
| BackBox | — | — | GNU General Public License |
| Barrelfish | — | — | MIT License |
| BeOS | Be Inc., Jean-Louis Gassée, Cyril Meurillon, Jean-Baptiste Maurice Quéru, Benoit Schillings, Dominic Giampaolo, Steve Sakoman | — | proprietary license |
| BlackPanther OS | — | — | — |
| Bliss OS | — | — | GNU General Public License, version 3.0 |
| 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 |
| Citrix WinFrame | Citrix Systems | 1995 | proprietary license |
| CrunchBang Linux | — | — | GNU General Public License |
| Cub Linux | — | — | — |
| CyanogenMod | CYNGN Inc. | 2009 | Android Open Source Project, Apache License, GNU General Public License |
| Damn Small Linux | John Andrews | — | GNU General Public License |
| Darwin | Apple Inc. | 2000 | Apple Public Source License |
| Debian | The Debian Project | 1993 | GNU General Public License |
| DR-DOS | DRDOS Inc, Digital Research | — | — |
| Edubuntu | Canonical Ltd. | — | GNU General Public License |
| EPOC | Psion | 1989 | — |
| Exherbo | — | — | — |
| Firefox OS | Mozilla Foundation, Mozilla Corporation | — | Mozilla Public License, Apache License, free license |
| FreeBSD | — | 1993 | 2-clause BSD License |
| FreeDOS | Jim Hall | 1998 | GNU General Public License |
| Freedows OS | — | — | — |
| FreeRTOS | — | 2003 | MIT License |
| Gentoo Linux | — | — | GNU General Public License |
| GNewSense | — | — | GNU General Public License |
| GOS | — | — | Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported |
| Haiku | Michael Phipps, Haiku Inc. | 2002 | MIT License |
| Hanthana Linux | — | — | GNU General Public License |
| IBM PC DOS | IBM | 1981 | proprietary license |
| IBM TopView | IBM | — | proprietary license |
| JavaOS | Sun Microsystems | — | proprietary license |
| Joli OS | — | 2011 | GNU General Public License |
| Kali Linux | OffSec | 2013 | GNU General Public License |