Nektony Disk Inspector Alternatives, Similar

Disk Inspector is a utility that allows you to locate "space eaters" – big files and folders saved on disks in your Mac.
Do you have any finishing free space on your disk? Thinking about buying a new disk?
Hold on before you do. First remove any unused stuff from your computer. Use Disk Inspector to find the biggest files on your Mac, and remove the unused files.
To do that, it scans the disk file structure, and shows your files and folders on the disk in a sunburst-like diagram. Bigger items are bigger on the diagram, so it's really easy to find bigger ones.
Disk Inspector allows you to scan: Hard Disk Volumes, CD and DVD disks, Flash drives, External storage disks, mounted DMG volumes, and even folders with FileVault protection!
Disk Inspector has a visual scanning mode, so that you can see the results even during the scan process. There is a small progress bar on the dock icon to show the current progress.
For every disk you can obtain additional information about it: if the disk is writable, bootable, the file system type, and connect protocol.
For every disk item, you can use QuickLook Preview, get additional detailed information, and show the item in Finder for operating it – to delete or move unused files.
For stability reasons, all hidden files are displayed as a single item in the diagram…. More Info »Features:
Animated scanning process
Displaying found files & folders during scan process
Progress bar during scanning process
Detailed volume information available
Information about files
QuickLook for files
Copy path for the item
Displaying the folders structure, skipping free space
And even rotate the resulting diagram!