JDiskReport enables you to understand how much space the files and directories consume on your disk drives, and it helps you find obsolete files and folders. Developed by JGoodies
License: Free
JDiskReport is a Windows-only tool with a focus on detailed visual reporting of disk usage, while Filelight is a Linux-centric application that offers interactive visualizations and real-time monitoring. Filelight is more integrated with the KDE environment, making it ideal for Linux users, whereas JDiskReport provides a standalone solution for Windows users.