FreeDOS is a project to recreate the MS-DOS operating system. Applications of FreeDOS mostly involve giving a free alternative for the commercial, and unsupported, MS-DOS. For example in DOSemu.
FreeDOS defrag is a project to recreate all of the features of the traditional defrag program. But it will go very much beyond the posibilities of the commercial product.
It will support FAT12, FAT16 and FAT32 and will leave your long file names intact. Which means that it will still be a great utility for people using old versions of windows, like win95 or win98.
These details are provided for information only. No information here is legal advice and should not be used as such.