Apps similar to SupaView include GrandPerspective, which is open source and free for personal use. Other options are Scanner and SequoiaView. In total there are three Disk Usage Analyzers like SupaView for Windows and Mac.
GrandPerspective is a small utility application for Mac that graphically shows the disk usage within a file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space.
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This tool uses a sunburst chart to display the usage of your hard disk or other media. The chart shows all major files and folders from all directory levels at once.
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Create a visual representation of the amount of space each file is taking on your hard drive. It creates a "squarified treemap" that makes it easy to see where all your space is going.
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