GoboLinux
GoboLinux is a modular Linux distribution: it organizes the programs in your system in a new, logical way. In GoboLinux you don't need a package database because the filesystem is the database: each program resides in its own directory, such as /Programs/Xorg-Lib/7.4 and /Programs/KDE-Libs/4.2.0. Instead of having parts of a program thrown at /usr/bin, other parts at /etc and yet more parts thrown at /usr/share/something/or/another, each program gets its own directory tree, keeping them all neatly separated and allowing you to see everything that's installed in the system and which files belong to which programs in a simple and obvious way.
