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.
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 sy…
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.