Apps similar to Space Gremlin include GrandPerspective, which is open source and free for personal use. Other options are DaisyDisk, DiskSight, DiskWave and xdu. In total there are five Disk Usage Analyzers like Space Gremlin for Mac and Linux.
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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Analyzes disk usage with an intuitive sunburst map, locating and previewing large or unused files across any mounted disk, with drag-and-drop management, fast scanning, real-time updates as files are removed, system integration, and support for various file systems.
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DiskWave is a free utility to help you determine where most of your hard drive space is consumed.
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