WinDirStat

Automated

Free, open-source disk usage analyzer and cleanup assistant for Windows that scans drives and folders and presents results as a treemap, file list, and extension statistics.

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Treemap visualization of disk usage
All Files and Largest Files views sorted by size
Duplicate Files detection
Search Results and File Watcher views
Extension list with file type statistics
Color-coded rectangles indicating file types
Open-source under GPLv2 (free)

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