SpaceSniffer alternatives
Programs you can use instead of SpaceSniffer. Free and open-source options come first; every download is from the publisher's official source.
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WinDirStat
WinDirStat is an open-source disk usage statistics viewer and cleanup utility for Microsoft Windows.
Shared platforms: Windows
Windows
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WizTree Free for personal use
WizTree is a high-speed disk space analyzer developed by Antibody Software for Windows.
Shared platforms: Windows
Windows
Other alternatives not on the site yet: TreeSize Free