DOS

DOS is also a subsystem of OS/2, running in cohabitation with version 1.x of OS/2 and as a task in version 2 and later. Furthermore DOS is also used as a collective name for a variety of operating systems that offer compatibility with the PC DOS system to varying degrees.

Products
This lists major DOS operating system products by several companies.


 * Digital Research (DRI) branch
 * DR DOS
 * Novell DOS
 * Caldera OpenDOS
 * Caldera DR-DOS
 * Lineo DR-DOS
 * DeviceLogics DR-DOS 8.1
 * IBM
 * PC DOS, IBM DOS
 * Lifeboat Associates
 * SB-86 - Software Bus-86
 * Microsoft (MS)
 * MS-DOS
 * PhysTechSoft
 * PTS-DOS
 * Seattle Computer Products (SCP)
 * 86-DOS
 * XDOS Family
 * XDOS (1988)
 * NSSDOS (1989)
 * DOS/NT
 * DOSC-C/Free-DOS/FreeDOS (1994)

Operating Systems with DOS Support
As above, only major or notable versions included.
 * IBM OS/2 Standard Edition 1.0, Extended Edition 1.0
 * IBM OS/2 Standard Edition 1.1, Extended Edition 1.1
 * IBM OS/2 Standard Edition 1.2, Extended Edition 1.2
 * IBM OS/2 Standard Edition 1.2, Extended Edition 1.3
 * Microsoft Windows 95
 * Microsoft Windows 98
 * Microsoft Windows 98 Second Edition
 * Microsoft Windows ME
 * PDOS

DOS Shells
Software that runs on top of DOS and takes over the operation of the machine to varying degrees.
 * DESQview
 * DESQview/X
 * GEM
 * Geos
 * IBM TopView
 * Lotus Magellan
 * Microsoft Windows - Versions 1 to 3.11
 * Tandy Deskmate
 * Visi On
 * Xtree

Links

 * DOS ain't dead - Probably the most active DOS related forum out there.
 * Interesting DOS programs