QDirStat is an open-source graphical application for Linux, Unix, and Mac OS X systems that provides an intuitive way to visualize disk usage statistics. It uses a tree map to represent the contents of the filesystem and allows users to quickly identify which files and directories are using the most disk space. It also offers a rich set of features such as directory comparison, visualization of hard links, symbolic links, and junctions, as well as support for multiple file systems and network shares. QDirStat is designed to be easy to use and provides detailed information about each file and directory. It also allows users to quickly delete unwanted files and directories, clean up their system, and reclaim disk space.
Discontinued The program seems to be no longer updated. The latest version, 2.13, released in July 2012, is fully functional and can still be downloaded from the official website.