Vyooh DiskView 

With DiskView add-in to Windows Explorer, you can manage your disk space wisely, and organize your files & folders without stepping out of Windows Explorer. DiskView helps you find big files at a glance, and visually shows how disk space is organized
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DPAN 

The Disk Performance Analyser for Networks is a stand-alone utility that detects and reports fragmentation-related performance loss on networked systems. It provides this never before available, easy to use functionality all from a single location.
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WatchDISK Disk Space Tracker 

WatchDISK provides the information you need to: Find out why free disk space has suddenly dropped, Project future storage needs, Justify additional storage capacity investments to management. Includes automated scans and low disk space warnings.
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Acronis Disk Director Suite 

Acronis Disk Director Suite is the only disk partitioning software that allows you to automatically or manually resize, copy and move partitions without losing data. It also lets you reorganize the hard drive structure and optimize disk space usage.
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MouseSoft Directory Size 

MDS reports where space is used on your local and network drives. Quickly identify where space is used. Export results to HTML, Text and Excel. Sort results by Size or Name
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Clean Star Sp@ce S@ver System 

Clean Star removes excess files left by software installations, web browsers, and printer activity. Removes common temporary files and is user customizable to remove specific file types as determined by the user/user's software.
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