The main page of the Xbox-Linux Wiki. Among other things, Xbox-Linux is a set of kernel patches for the 2.4 series kernel to support all Xbox hardware (except the 3D acceleration of the graphics chip.)
Debian is a seriously free Linux distribution which is the basis of many other distributions (including Ubuntu.)
Knoppix is a debian-based LiveCD Linux distribution
Damn Small Linux ("DSL") is a small Linux distribution designed to be run from CD.