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DOS - http://en.wikipedia.org/wiki/DOS
Wikipedia article covering the history and design of DOS.
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Doctor DOS Betamax; DOS Operating System - http://www.chebucto.ns.ca/~ak621/DOS/DOS-Head.html
Commentary, tutorials, references, Power-Users' Corner, for DOS and related utilities.
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Unofficial PTS-DOS FAQ - http://www.almnet.de/ptsdos/index.en.html
In English and German languages; with wiki, downloads, links.
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ZDOS - http://www.zebor.com
Realtime, 32-bit replacement for 16-bit DOS, with modern features: multitasking, demand paging, SMP. Coded in pure Assembly language. Zebor Technology.
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RMF-DOS - http://sourceforge.net/projects/rmfdos/
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]
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RealDOS - http://www.realdos.de/english/
A barebones DOS alternative.
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PhysTechSoft Ltd. - http://www.phystechsoft.com/ptsdos/
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.
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Georgos the DOS compatible operating system - http://www.georgos.org/
A free DOS-compatible operating system. Sample applications, discussion forum, and development information.
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Shell Tips - http://www.shell-tips.com/category/dos-windows-batch-files/
Weblog covering useful tips for a number of command line interfaces including the DOS shell.
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