SpaceSniffer is a freeware disk space analyzer for Windows that make use of the Treemap concept to view the current disk usage. Among the most notable features you'll find: Features drag and drop support intuitive structure layout (multiple views for different media) zoom elements (browser-like navigation) powerful filtering (you can …

WinDirStat is a disk usage statistics viewer and cleanup tool for various versions of Microsoft Windows. On start up, it reads the whole directory tree once and then presents it in three useful views: The directory list, which resembles the tree view of the Windows Explorer but is sorted by …