| JavaOS | Sun Microsystems | — | proprietary license |
| KaiOS | KaiOS Technologies, Inc. | — | GNU General Public License, version 2.0 |
| Kali Linux | OffSec | 2013 | GNU General Public License |
| Kali Purple | OffSec | — | GNU General Public License |
| Kubuntu | Canonical Ltd. | 2005 | GNU General Public License |
| LibreELEC | — | — | GNU General Public License, version 2.0 |
| LineageOS | — | 2016 | GNU General Public License, version 2.0, Apache License |
| MacOS Big Sur | Apple Inc. | 2020 | proprietary license, Apple Public Source License |
| MacOS Golden Gate | Apple Inc. | 2026 | — |
| MacOS Monterey | Apple Inc. | 2021 | proprietary license, Apple Public Source License |
| MacOS Sequoia | Apple Inc. | — | — |
| MacOS Tahoe | — | — | — |
| MacOS Ventura | Apple Inc. | 2022 | — |
| Maemo | Nokia | — | — |
| MeeGo | Linux Foundation, Intel, Novell, Nokia, AMD | — | GNU General Public License, version 2.0 or later |
| Microsoft Windows | Microsoft | 1985 | proprietary license |
| Midori | Microsoft | — | — |
| MINIX | Andrew S. Tanenbaum | — | 3-clause BSD License |
| Miosix | Federico Terraneo | 2009 | GNU General Public License |
| MIUI | Xiaomi | — | GNU General Public License, version 3.0, Apache Software License 2.0 |
| Mobian | — | — | — |
| NetBSD | — | 1993 | BSD licenses |
| Nokia X | — | — | — |
| Nothing OS | Nothing Technology Ltd. | — | Android Open Source Project |
| Nucleus RTOS | Mentor Graphics | — | — |
| Nura | — | — | GNU General Public License, version 3.0 |
| OmniROM | — | 2013 | Apache License |
| OpenELEC | — | 2009 | GNU General Public License |
| OpenMandriva | — | — | GNU General Public License |
| OpenMediaVault | Volker Theile | 2009 | GNU General Public License, version 3.0 |
| OpenSUSE | OpenSUSE Project | — | GNU General Public License |
| OpenTX | Bertrand Songis | — | GNU General Public License |
| OpenWrt | Gábor Juhos, Florian Fainelli, Hauke Mehrtens, Jo-Philipp Wich | 2004 | GNU General Public License, version 2.0 |
| OSMC | — | — | GNU General Public License, version 2.0 |
| OxygenOS | OnePlus | 2015 | — |
| Palm OS | Palm, Inc., Access | — | proprietary license |
| Parabola GNU/Linux-libre | — | — | GNU General Public License |
| Parch Linux | — | — | GNU General Public License |
| Plan 9 | Bell Labs | 1992 | GNU General Public License, version 2.0, MIT License, Lucent Public License |
| Pop!_OS | System76 | 2017 | GNU General Public License |
| Q4OS | — | 2013 | GNU General Public License |
| Raspberry Pi OS | Raspberry Pi Holdings | 2012 | GNU General Public License |
| Resurrection Remix OS | — | 2012 | — |
| RISC OS | Acorn Computers, RISCOS Ltd, RISC OS Open, Castle Technology | — | freeware |
| RouterOS | MikroTik | — | — |
| RTEMS | Sebastian Huber, Joel Sherrill | — | GNU General Public License |
| Sailfish OS | Jolla | — | — |
| SolydXK | — | 2013 | — |