| Microsoft Windows | Microsoft | 1985 |
| MP/M | Digital Research, Tom Rolander | — |
| MS-DOS | Microsoft | 1981 |
| MS-DOS 6.22 | Microsoft | 1994 |
| MS-DOS 7 | Microsoft | — |
| MVS | IBM | 1974 |
| NeoKylin | — | — |
| NeXTSTEP | NeXT | — |
| Nintendo Switch system software | HAL Laboratory, Nintendo | 2017 |
| OcNOS | IP Infusion | — |
| OpenVMS | VMS Software Inc., Hewlett-Packard, Digital Equipment Corporation, Compaq | 1977 |
| OS/2 | IBM, Microsoft | — |
| OS/360 | IBM | 1966 |
| Palm OS | Palm, Inc., Access | — |
| PTS-DOS | Paragon Software Group | 1993 |
| RT-11 | Digital Equipment Corporation | — |
| Sinclair QDOS | Sinclair Research | 1984 |
| Sintran | — | 1968 |
| Solaris | Sun Microsystems, Oracle Corporation | 1991 |
| SOX Unix | BB Tecnologia e Serviços | — |
| SPIX | Groupe Bull | — |
| Splashtop | — | — |
| Suicide Linux | — | 2009 |
| SunOS | Sun Microsystems | — |
| Symbian | Symbian Foundation, Nokia, Symbian Software | — |
| System 1 | Apple Inc. | 1984 |
| System 6 | Apple Inc. | — |
| System 7 | Apple Inc. | — |
| Tru64 UNIX | Hewlett-Packard, Digital Equipment Corporation, IBM, Compaq | — |
| TrueNAS | IXsystems | — |
| TSS-8 | Digital Equipment Corporation | 1968 |
| UnixWare | Novell, SCO Group, Caldera, Santa Cruz Operation, Univel | — |
| Version 6 Unix | Bell Labs | 1975 |
| Windows 2.0 | Microsoft | 1987 |
| Windows 2.1 | Microsoft | — |
| Windows 2000 | Microsoft | 2000 |
| Windows 3.0 | Microsoft | — |
| Windows 3.1x | Microsoft | — |
| Windows 95 | Microsoft | — |
| Windows 98 | Microsoft | 1998 |
| Windows Embedded Compact 7 | Microsoft | — |
| Windows Home Server 2011 | Microsoft | — |
| Windows Mobile | Microsoft | — |
| Windows NT 3.5 | Microsoft | — |
| Windows NT 3.51 | Microsoft | 1995 |
| Windows Server | Microsoft | — |
| Windows Server 2025 | Microsoft | 2024 |
| Xenix | Microsoft, Santa Cruz Operation, AT&T Corporation | — |