WinDirStat is a free, open-source disk usage analyzer and cleanup software for Microsoft Windows. Mac OS X users should use Disk Inventory X or GrandPerspective alternatives. Linux users should try KDirStat or others such as Baobab (a component module of gnome-utils package). The program can scan local partitions or entire hard disk drive, presenting the results under a colorful graphical image for used space. It is also a cleanup tool as it allows you to delete files that take much space. The advantage of using this tool is that you can identify files that took the most space and you can also delete them directly from main program interface.