Disk Operating Systems
- 86-DOS (developed at Seattle Computer Products by Tim Paterson for the new Intel 808x CPUs; licensed to Microsoft, became PC DOS/MS-DOS. Also known by its working title QDOS.)
- PC DOS (IBM's DOS variant, developed jointly with Microsoft, versions 1.0–7.0, 2000, 7.10)
- MS-DOS (Microsoft's DOS variant for OEM, developed jointly with IBM, versions 1.x–6.22 Microsoft's now abandoned DOS variant)
- Concurrent CP/M-86 3.1 (BDOS 3.1) with PC-MODE (Digital Research's successor of CP/M-86 and MP/M-86)
- Concurrent DOS 3.1-4.1 (BDOS 3.1-4.1)
- Concurrent PC DOS 3.2 (BDOS 3.2) (Concurrent DOS variant for IBM compatible PCs)
- DOS Plus 1.2 (BDOS 4.1), 2.1 (BDOS 5.0) (single-user, multi-tasking system derived from Concurrent DOS 4.1-5.0)
- Concurrent DOS 8-16 (dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs)
- Concurrent DOS 286 1.x
- FlexOS 1.00-2.34 (derivative of Concurrent DOS 286)
- FlexOS 186 (variant of FlexOS for terminals)
- FlexOS 286 (variant of FlexOS for hosts)
- Siemens S5-DOS/MT (industrial control system based on FlexOS)
- IBM 4680 OS (POS operating system based on FlexOS)
- IBM 4690 OS (POS operating system based on FlexOS)
- FlexOS 386 (later variant of FlexOS for hosts)
- IBM 4690 OS (POS operating system based on FlexOS)
- FlexOS 1.00-2.34 (derivative of Concurrent DOS 286)
- Concurrent DOS 386 1.0, 1.1, 2.0, 3.0 (BDOS 5.0-6.2)
- Concurrent DOS 386/MGE (Concurrent DOS 386 variant with advanced graphics terminal capabilities)
- Multiuser DOS 5.0, 5.01, 5.1 (BDOS 6.3-6.6) (successor of Concurrent DOS 386)
- CCI Multiuser DOS 5.0-7.22 (up to BDOS 6.6)
- Datapac Multiuser DOS
- Datapac System Manager 7 (derivative of Datapac Multiuser DOS)
- IMS Multiuser DOS 5.1, 7.0, 7.1 (BDOS 6.6-6.7)
- IMS REAL/32 7.50, 7.51, 7.52, 7.53, 7.54, 7.6, 7.7, 7.8, 7.90, 7.91, 7.92, 7.93, 7.94, 7.95 (BDOS 6.8 and higher) (derivative of Multiuser DOS)
- IMS REAL/NG (successor of REAL/32)
- IMS REAL/32 7.50, 7.51, 7.52, 7.53, 7.54, 7.6, 7.7, 7.8, 7.90, 7.91, 7.92, 7.93, 7.94, 7.95 (BDOS 6.8 and higher) (derivative of Multiuser DOS)
- Concurrent DOS XM 5.0, 5.2, 6.0, 6.2 (BDOS 5.0-6.2) (real-mode variant of Concurrent DOS with EEMS support)
- DR DOS 3.31, 3.32, 3.33, 3.34, 3.35, 5.0, 6.0 (BDOS 6.0-7.1) single-user, single-tasking native DOS derived from Concurrent DOS 6.0)
- Novell PalmDOS 1.0 (BDOS 7.0)
- Novell DR DOS "StarTrek"
- Novell DOS 7 (single-user, multi-tasking system derived from DR DOS, BDOS 7.2)
- Novell DOS 7 updates 1-10 (BDOS 7.2)
- Caldera OpenDOS 7.01 (BDOS 7.2)
- Enhanced DR-DOS 7.01.0x (BDOS 7.2)
- Caldera OpenDOS 7.01 (BDOS 7.2)
- Novell DOS 7 updates 11-15.2 (BDOS 7.2)
- Caldera DR-DOS 7.02-7.03 (BDOS 7.3)
- DR-DOS "WinBolt"
- OEM DR-DOS 7.04-7.05 (BDOS 7.3)
- OEM DR-DOS 7.06
- OEM DR-DOS 7.07 (BDOS 7.4/7.7)
- Caldera DR-DOS 7.02-7.03 (BDOS 7.3)
- Novell DOS 7 updates 1-10 (BDOS 7.2)
- DR DOS 3.31, 3.32, 3.33, 3.34, 3.35, 5.0, 6.0 (BDOS 6.0-7.1) single-user, single-tasking native DOS derived from Concurrent DOS 6.0)
- Concurrent PC DOS 3.2 (BDOS 3.2) (Concurrent DOS variant for IBM compatible PCs)
- Concurrent DOS 3.1-4.1 (BDOS 3.1-4.1)
- FreeDOS (open source DOS variant)
- ProDOS (operating system for the Apple II series computers)
- PTS-DOS (DOS variant by Russian company Phystechsoft)
- RDOS by Leif Ekblad (not to be confused with Data General Corporation's "Real-time Disk Operating System" for Data General Nova and Data General Eclipse minicomputers).
- TurboDOS (Software 2000, Inc.) for Z80 and Intel 8086 processor-based systems
- Multi-tasking user interfaces and environments for DOS
- DESQview+ QEMM 386 multi-tasking user interface for DOS
- DESQView/X (X-windowing GUI for DOS)
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