| DOS/360 | IBM | 1966 | — |
| EComStation | XL Software Europe | — | proprietary license |
| GEOS | GeoWorks | 1986 | proprietary license |
| HP-UX | Hewlett Packard Enterprise | 1984 | proprietary license |
| IBM AIX | IBM | 1986 | proprietary license |
| IBM i | IBM | — | — |
| MacOS | Apple Inc. | 2001 | BSD licenses, proprietary license, Apple Public Source License |
| Microsoft Windows | Microsoft | 1985 | proprietary license |
| Nintendo Switch system software | HAL Laboratory, Nintendo | 2017 | proprietary license |
| SkyOS | Robert Szeleney | 1997 | — |
| UnixWare | Novell, SCO Group, Caldera, Santa Cruz Operation, Univel | — | proprietary license |
| Xinuos OpenServer | Santa Cruz Operation, Xinuos | — | proprietary license |