FilePro is a free software for windows and it allows you to graphically view the distribution of hard disk space among files.
Generate disk treemaps for local or network volumes
Search and locate files in treemaps by automatic zoom-in and positioning.
Save entire or partial volume snapshots
Compare snapshot against current disk state or past snapshots
Examine changes by difference in size or percentage difference
Copy/Move/Rename/Delete files or directories
Compare files and/or directories
Find duplicate files