See also:

• Computers: Software: Operating Systems: Linux: Distributions: Tiny: DOS Friendly  (2)
• Computers: Software: Operating Systems: Monolithic  (2)

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• Commands Reference with Versions, Syntax, Notes, and Examples - Index, description, and syntax, of all built-in commands available in all versions of DOS/Windows since v1.00.
• Doctor DOS Betamax; DOS Operating System - Commentary, tutorials, references, Power-Users' Corner, for DOS and related utilities.
• DOS - Wikipedia article covering the history and design of DOS.
• Georgos the DOS compatible operating system - A free DOS-compatible operating system. Sample applications, discussion forum, and development information.
• 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]
• Shell Tips - Weblog covering useful tips for a number of command line interfaces including the DOS shell.
• Unofficial PTS-DOS FAQ - In English and German languages; with wiki, downloads, links.
• ZDOS - Realtime, 32-bit replacement for 16-bit DOS, with modern features: multitasking, demand paging, SMP. Coded in pure Assembly language. Zebor Technology.