ROM-DOS - Full embedded OS; compact, reliable, fully compatible DOS for embedded use and mobile computing environments. By Datalight.RealDOS - A barebones DOS alternative.
PC DOS 2000 - IBM's DOS, one of the two original DOSes for the IBM PC. Now year 2000 compliant, and updated for a new century. Preserve your investment in DOS applications.
PTS-DOS 2000 - DOS alternative with network support, file manager, archiver, internal boot virus protection, graphical web browser, e-mail client, telnet and ftp client. Includes utilities for embedded system development. Operating System PTS-DOS 2000, with network support, file manager, archiver, internal boot viruses protection and numerous utilities.
FreeDOS 32 - A 32-bit DOS-like operating system. This project is interested in extending the capabilities of FreeDOS into a native 32-bit environment.
MOE-DOS - Free, small, experimental single tasking, single user DOS clone for 8086/8088s (IBM) and up.
Turkish Rational DOS - The core of DOS compatible operating system that is currently under development.
DOS2 - To be 32-bit, protected-mode, modular, multitasking, visual OS, written in Assembly, using: long filenames, FAT-12/16/32 RxDOS filesystem, DOS function names and numbers, elements and ideas from RxDOS, first kernel is modified ShawnOS. [Open Source]
Paul Edwards's Programming Page - Contains PDOS, a public domain DOS alternative.
MOE-DOS Kernel Development - Contains technical information about the development of the kernel for the DOS alternative known as MOE-DOS.
PC DOS for Embedded Systems - A retooling of IBM's DOS for use in embedded systems.
