DR-DOS
Club DR-DOS, DeviceLogics, Inc., DR-DOS Forum by DrDOS.Ws, OpenDOS Stuff, OpenDOS Unofficial Page, The DR-DOS/OpenDOS Enhancement Project, Unofficial DR-DOS Resources
FAQs, Help, and Tutorials
Allexperts DOS, EasyDOS Internet Guide to DOS, Erik's DOS Help Files - Includes all DOS Comm, Fdisk Information, Fusion 13 Computing, Getting Started with DOS, MalekTips: DOS Table of Contents, MS-DOS 5.0 Help and Information, MS-DOS 7 Commands, MS-DOS 7 from Windows 95/98
FreeDOS
FreeCOM, FreeDOS, FreeDOS 32, FreeDOS home page mirror: Austria, FreeDOS Info Page, FreeDOS Kernel Site, FreeDOS Mailing list ARChives at PPC, FreeDOS mirror site, FreeDOS WebRing, Jim's FreeDOS page
Internet
Arachne WWW browser for DOS, Barebones DOS email system, DOS Dialup Internet Access, DOS TCP/IP etc., DOS Text Mode Internet Utilities, DosLynx Quick Start, FDISK DOS Internet Page, Help Page for Arachne, Net-Tamer shareware browser, SurvPC Mailing List
Programming
Compilers, Languages, Libraries, Tutorials, 386SWAT, comp.os.msdos.programmer FAQ, Mouse Programming in DOS, Programming MS-DOS with Power, Ralf Brown's Interrupt List, Ralf Brown's Interrupt List, UPX, X2FTP Archive
Software
16 Bit OS, 4DOS, 4XBTM, CuteMouse, DOG, DOS-Only, DOS-Tools (DOS rules), DosUser, DWin, FileC
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.
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]
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.
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.