| Doctor DOS Betamax Power-Users' Corner: Commentary, tutorials, and references for MS-DOS and related utilities. | |
| Dos/Windows commands since v1.00: An index of all built-in commands available in all versions of MS-DOS. Includes description and syntax of commands. | |
| Georgos the DOS compatible operating system: A free DOS-compatible operating system. Site includes sample applications, discussion forum, and development information. | |
| IBM Corp.: Makes PC DOS 2000; was 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. | |
| Idiots Operating System: A floppy-disk based operating systems distribution with a focus on multimedia applications. | |
| Paul Edwards's Programming Page: Contains PDOS, a public domain DOS alternative. | |
| PC DOS for Embedded Devices: Retooling of IBM PC DOS for use in embedded systems. | |
| PhysTechSoft Ltd.: Makes PTS-DOS 2000: network support, file manager, archiver, internal boot virus protection, graphical web browser; email, telnet, FTP clients; many utilities, some for embedded system development. | |
| RealDOS: A barebones DOS alternative. | |
| RMF-DOS: Reduced Memory Footprint; goals: match functions of MS-DOS 6.22, IBM PC DOS 7.00, DR-DOS 7 subset. Written mainly in 2 free C compilers and assembler, most parts are smaller uncompressed than compressed parts of MS, IBM, DR. [Open Source, BSD] | |
| The unofficial PTS-DOS FAQ: In German and in English language. Also wiki, downloads, and links. | |
| Turkish Rational DOS: The core of DOS compatible operating system that is currently under development. | |
| ZDOS: A 32-bit multitasking, real time replacement for MS-DOS. |
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