| A/UX | Apple Inc. | — |
| AdiOS | AdiOS | — |
| AMIBIOS | American Megatrends | 1985 |
| AmigaDOS | Commodore International | — |
| AmigaOS 4 | Hyperion Entertainment | 2006 |
| AmiKit | — | — |
| Android 12 | Google | — |
| Android Auto | Google | 2015 |
| Android TV | Google | 2014 |
| Armed Forces mobile system | — | — |
| Bada | Samsung Electronics | — |
| BeOS | Be Inc., Jean-Louis Gassée, Cyril Meurillon, Jean-Baptiste Maurice Quéru, Benoit Schillings, Dominic Giampaolo, Steve Sakoman | — |
| BlackBerry 10 | BlackBerry | — |
| BlackBerry OS | BlackBerry | 1999 |
| BOS/360 | IBM | — |
| BridgeOS | Apple Inc. | — |
| ChromeOS | Google | — |
| Cisco IOS XE | Cisco | — |
| Citrix WinFrame | Citrix Systems | 1995 |
| CP/M-86 | Digital Research | — |
| DRYOS | Canon Inc. | — |
| EComStation | XL Software Europe | — |
| Elastix | — | — |
| EMUI | Huawei | — |
| Freespire | Linspire | — |
| General Comprehensive Operating System | General Electric | 1962 |
| GEOS | GeoWorks | 1986 |
| HP-UX | Hewlett Packard Enterprise | 1984 |
| IBM AIX | IBM | 1986 |
| IBM PC DOS | IBM | 1981 |
| IBM TopView | IBM | — |
| Idris | P. J. Plauger | — |
| IOS | Apple Inc. | 2007 |
| IOS 13 | Apple Inc. | 2019 |
| IPadOS | Apple Inc. | 2019 |
| IPhone OS 1 | Apple Inc. | 2007 |
| JavaOS | Sun Microsystems | — |
| Jolicloud | — | — |
| LAN Manager | 3Com, Microsoft | — |
| LOCUS | University of California, Los Angeles | — |
| Mac OS 8 | Apple Inc. | — |
| Mac OS 9 | Apple Inc. | — |
| MacOS | Apple Inc. | 2001 |
| MacOS Big Sur | Apple Inc. | 2020 |
| MacOS Monterey | Apple Inc. | 2021 |
| MacOS Server | Apple Inc. | 1999 |
| MagicOS | Honor | 2016 |
| MenuetOS | — | — |