DiskState 

Powerful duplicate file analyzer can help clean up e.g. MP3s, image files. Get rid of that space wasted from program crashes and normal use. 100% safe with recovery. Get reports, find changes to folders, cover tracks after surfing with more features.
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SizeExplorer Report Generator 

SizeExplorer Report Generator is a command line tool that let you generate reports from a live disk exploration or from a saved disk exploration from SizeExplorer (i.e. a .sef file) SEReport supports generation of reports into a variety of file formats.
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Dispexplorer 

Hard disk utility that helps you track disk space usage. It uses stylish and unique 3d graphics. Helps you understand where is lost most of disk space. It's unique disk utility that makes your file system more organized. More info on site.
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Acronis Partition Expert 

Acronis Partition Expert is the only disk partitioning software that allows you to automatically or manually resize, copy and move partitions without losing data. Now Acronis Partition Expert is named Acronis Disk Director Suite.
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DirSize 

Command line tool that can easily be automated to generate nightly reports of disk space usage, network space hogs and very large folder trees. Reports can be sorted and small folders can be prevented from being displayed.
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Disk Space Inspector 

Disk Space Inspector is a feature-packed, yet easy to use, hard disk analysis, file management and disk space reporting software. The application allows for managing and monitoring disk space on local and network computers.
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