dos

arpwatch is a computer software tool for monitoring Address Resolution Protocol traffic on a computer network. It generates a log of observed pairing of IP addresses with MAC addresses along with a timestamp when the pairing appeared on the network.

DOSBox-X is a fork of DOSBox that expands its PC hardware emulation (from the original IBM PC to progressively improving those of Windows 9x era) and all the options needed to tweak and configure the DOS virtual machine.

FreeDOS is a complete, free, 100% MS-DOS compatible operating system. Works on old hardware, in DOS emulators, and in embedded systems.

vDos lets you conveniently run DOS applications by emulating a (spiced up) DOS PC in a window. vDos itself runs on Windows 32 and 64-bit systems, Windows 7 or later.