Concurrent DOS, the successor of Concurrent CP/M-86 with PC-MODE.

Concurrent CP/M-68K, a variant for the 68000.

Concurrent CP/M 8-16, a dual-processor variant of Concurrent CP/M for 80 CPUs.

Concurrent CP/M-86, the successor of CP/M-86 and MP/M-86.

Concurrent CP/M, the successor of CP/M-80 and MP/M-80.

MP/M 8-16, a dual-processor variant of MP/M for 80 CPUs.

CP/M CP/M for Intel 8080/ 8085 and Zilog Z80.

HeartOS – POSIX-based Hard Real-Time Operating System.

Deos – Time & Space Partitioned RTOS, Certified to DO-178B, Level A since 1998.

DOS Disk Operating System for the Datapoint 2200, 5500, and 1100.

CTOS Cassette Tape Operating System for the Datapoint 2200.

RDOS Real-time Disk Operating System, with variants: RTOS and DOS (not related to PC DOS, MS-DOS etc.).

AOS for 16-bit Data General Eclipse computers and AOS/VS for 32-bit (MV series) Eclipses, MP/AOS for microNOVA-based computers.

Cromix – a multitasking, multi-user, Unix-like OS for Cromemco microcomputers with Z80A and/or 68000 CPU.

Cromemco DOS (CDOS) – a Disk Operating system compatible with CP/M.

Convergent Technologies Operating System – later acquired by Unisys.

SIPROS (Simultaneous Processing Operating System).

MACE (Mansfield and Cahlander Executive).

SCOPE (Supervisory Control Of Program Execution).

Unix System V Releases 2.0, 3.0, 3.2, 4.0, and 4.2Ĭontrol Data Corporation Lower 3000 series.

UNIX Time-Sharing System v7 (It is from Version 7 Unix (and, to an extent, its descendants listed below) that almost all Unix-based and Unix-like operating systems descend.).

Unix ('Ken's new system,' for its creator ( Ken Thompson), officially Unics and then Unix, the prototypic operating system created in Bell Labs in 1969 that formed the basis for the Unix family of operating systems).

magnussoft ZETA (based on BeOS r5.1d0 source code, developed by yellowTAB).

Domain/OS – One of the first network-based systems.

Unnamed NetBSD variant for Airport Extreme and Time CapsuleĪpollo Computer, Hewlett-Packard.

iPod software (unnamed embedded OS for iPod).

macOS Server (formerly Mac OS X Server and OS X Server).

A/UX ( UNIX System V with BSD extensions).

1.66.5 Other proprietary Unix-like and POSIX-compliant.

1.56 Tandem Computers, Compaq, Hewlett-Packard, Hewlett Packard Enterprise.

1.38 Lynx Real-time Systems, LynuxWorks, Lynx Software Technologies.1.33.3 On PC and Intel x86 based architectures.1.29 Hewlett-Packard, Hewlett Packard Enterprise.

1.21 Digital Equipment Corporation, Compaq, Hewlett-Packard, Hewlett Packard Enterprise.

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