WizTree

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GNOME Disks

TreeSize is a disk space manager for Windows. The application is used by over 100,000 people to identify where storage space is going. TreeSize provides a visual representation of your harddrive, and tools to clean up unwanted files to increase overall storage space.

DaisyDisk is a freemium disk analyzer application for macOS. With DaisyDisk you can visualizes hard disk usage and get a broad overview on how to free up hard disk space. Through an intuitive interface with an interactive sunburst chart that you can use to easily navigate your hard disk, and free up space by deleting large files that you don't use.

Disk Inventory X is a disk usage utility for MacOS. Disk Inventory X helps users get an understaning of their computers disk space and how it is uitilized. Disk Inventory X answers this questions by providing an overview of files and folder and their size, with an easy-to-unstand graphical user interface that display disk space using treemaps. Disk Inventory X is released fully free and open-source under the GNU General Public License.

GParted is a free and open source partition editor for graphically managing your disk partitions. With GParted you can resize, copy, and move partitions without data loss. The software enables you to grow and shrink your C: drive, create new space for operating systems and attempting data rescue from lost partitions on your hard drives.

KDE Partition Manager is a utility software to help you manage the disk devices, partitions and file systems on your Linux-powered computer. With KDE Partition Manager, you can easily create, copy, move, delete, resize without losing data, backup and restore partitions.