Recs.
Updated
The ROX Desktop is a graphical desktop environment for the X Window System. It is based on the ROX-Filer which is a drag and drop spatial file manager.
Specs
Pros
Pro DirIcons and AppDirs make available a powerful set of tools
Rox allows .DirIcon files to alter the icon for directories they're in. Rox also allows special directories -- AppDirs -- that act like executables, but which contain all that's needed to run its application. The executables can be anything -- script, elf file, or even a link to an executable, and of course, its icon can be any .DirIcon you that place in the AppDir. It even lets you define menus that pop up when you right-click the AppDir, and tooltips that popup when you hover the mouse over the AppDir. This is an extraordinarily powerful and flexible technique for quickly and easily creating and adapting tools.