Site: http://windirstat.info/
WinDirStat is a disk usage statistics viewer and cleanup tool for Microsoft Windows (all current variants).
The treemap represents each file as a colored rectangle, the area of which is proportional to the file's size. The rectangles are arranged in such a way, that directories again make up rectangles, which contain all their files and subdirectories. So their area is proportional to the size of the subtrees. The color of a rectangle indicates the type of the file, as shown in the extension list.
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