GNOME Disks

vs

DaisyDisk

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.

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.

With CCleaner you can speed up your slow Mac or PC by cleaning up outdated software and cached files. CCleaner has been the go-to software for protecting and cleaning Windows computers for years. The software was built at a time when Microsoft Windows lacked many of the built-in security features found in operating systems like macOS or Linux. CCleaner can be used to clean potentially unwanted files and invalid Windows Registry entries from a computer. In 2012 CCleaner released a version for macOS.

A user-friendly problem fixer for macOS. With CleanMyMac X you can delete system junk, unwanted apps, malware, and tune your macOS operating system for maximum performance. On average CleanMyMac X cleans 74GB of hard-drive space, which instead can be used for storing music, movies or photos that are dear to you.