For those that haven't heard yet, FreeDOS 1.1 has been released after being in development for several years.
Among the new features since the 2006 release of FreeDOS 1.0 is, according to the release announcement
, the FreeDOS 2040 kernel, a new suite of high-performance TCP/IP x86 applications, initial USB UHCI controller support, a new install menu from the CD, a universal BIOS back-up program (FlashROM), updated memory drivers, limited USB flash disk support, and many program updates.
FreeDOS is meant as a free software replacement to Microsoft's MS-DOS. FreeDOS is commonly good enough to be used for an environment from flashing your motherboard's BIOS, among other tasks.
Find more details or download this DOS operating system from FreeDOS.org