AdvanceCD is a bootable live CD, DVD, and USB disk
that contains a minimal Linux distribution
containing the AdvanceMAME emulator. You can boot
it on any PC and play the contained games without
Nuclinux is a single-floppy Linux
mini-distribution. It's designed primarily to
connect to the Internet and use Internet programs
(like links, ssh, irc, ftp, telnet, finger, etc.)
from a networked machine.
Circle Mud Linux is a three-disk mini-distribution for running the Circle MUD Server. It is based on libc5. It is also a good distribution for MUD players who can use it to quickly and temporarily turn any PC into a MUD console.