Recently I've installed FreeDOS inside a VM, both out of curiosity and for my assembly course homework. FreeDOS, for the unfamiliar readers, is a 100% compatible GPL'd DOS OS. It ships with many modern utils such as ssh (Yes, it has Ethernet + TCP/IP support.. EVIL!), lynx, vim, a graphical web browser..
I was astonished to find out this very-active blog, which proved me that DOS is still alive! A new version of 4DOS was just released a few days ago, who'd believe...
A very nice work, though I don't see too many reasons for using DOS nowadays (except for nostalgia and for playing old dos games).. It's still a deprecated, single-tasking, not protected-mode, no package-management OS.. And hardware configuration can be hell, well.