Complete, free, MS-DOS compatible operating system with no enhancements or advanced features such as multitasking, protected mode operation, GUI. http://www.freedos.org/
To extend abilities of FreeDOS into native 32-bit system, based on simple, fully expandable, modular core; features like memory protection, multitasking, support for many filesystems can be added by external components. [Open Source, GPL] http://freedos-32.sourceforge.net/
Home of FreeDOS Ripcord distributions (possible unstable, but includes newer software) . Also mirrors main and Spanish FreeDOS sites. http://www.fdos.org
Contains free DOS related utilities and mirrors of useful information. Official home of pdTree, a tree clone for DOS and Win32. http://www.darklogic.org/fdos/
For users and programmers, especially enthusiasts of making our own PC system It contains binaries, sources and informations for FreeDOS. http://www.freewebs.com/pcsystem/