- RealDOS - A barebones DOS alternative.
- Turkish Rational DOS - The core of DOS compatible operating system that is currently under development.
- Paul Edwards's Programming Page - Contains PDOS, a public domain DOS alternative.
- Idiots Operating System - A floppy-disk based operating systems distribution with a focus on multimedia applications.
- ROM-DOS - Full embedded OS; compact, reliable, fully compatible DOS for embedded uses, mobile computing environments, fast connecting of embedded systems to Internet. By Datalight, Inc.
- 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.
- PC DOS for Embedded Devices - Retooling of IBM PC DOS for use in embedded systems.
- 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]
- 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.
- 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.
- Doctor DOS Betamax Power-Users' Corner - Commentary, tutorials, and references for MS-DOS and related utilities.
- Georgos the DOS compatible operating system - A free DOS-compatible operating system. Site includes sample applications, discussion forum, and development information.
- The unofficial PTS-DOS FAQ - In German and in English language. Also wiki, downloads, and links.
- ZDOS - A 32-bit multitasking, real time replacement for MS-DOS.
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