Hallo!
www.freedos.org
FreeDOS aims to be a complete, free, 100% MS-DOS compatible operating system.
FreeDOS is ideal for anyone who wants to bundle a version of DOS without having to pay a royalty for use of DOS. FreeDOS will also work on old hardware, in DOS emulators, and in embedded systems. FreeDOS is also an invaluable resource for people who would like to develop their own operating system. While there are many free operating systems out there, no other free DOS-compatible operating system exists.
FreeDOS is free because it is released under the GNU General Public License. The GNU license, created by the Free Software Foundation, is the same one used by GNU Emacs and Linux. This means you have access to the source code for all FreeDOS programs; check out the software list for a list of where to download the original code, or go to the files archive to download our local copies. FreeDOS is distributed in the hopes it will be useful.
At this time, it is not planned to add advanced features to FreeDOS such as multitasking, although we may add extensions to DOS commands by way of command line options or extra functionality. The reason for this is that we first seek to duplicate and enhance the original functionality of DOS, because such an operating system is still useful.
Ciao,
Steve