Summary : Graphical disk usage statistics

Description :
Filelight allows you to quickly understand exactly where your
diskspace is being used by graphically representing your file
system as a set of concentric segmented-rings. You can use it
to locate hotspots of disk usage and then manipulate those
areas using a file manager.

URL : http://utils.kde.org/projects/filelight/
License : GPLv2 and LGPLv2 and GPLD