From LQWiki

andLinux

andLinux is a Debian based Linux distribution that runs in Windows. Although originally designed for development, andLinux is a full Linux distribution and can be used like any other Linux distro (without modification). andLinux allows Linux applications to integrate seamlessly into your Windows desktop allowing Linux applications to work, look and feel like Windows applications. The current version is PreBeta (due to its lack of full installer) and is based on Ubuntu.