3Dfm 

3Dfm displays files and folders in an interactive, 3D display. You can rotate, pan and zoom the view, change folders, easily compare file and folder sizes, quickly search for files based on name, content, or size, view images, etc.
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FolderBox 

FolderBox is an free extension for Windows Explorer. It displays additional folders in the lower part of Explorer, which enables you to display the contents of two or more folders at once! You can use FolderBox also inside Internet-Explorer.
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