This site explains the SpaceSniffer Windows utility, storage treemaps, troubleshooting and safe file-management decisions. The program itself is developed by Umberto Uderzo. This website organizes educational materials and does not claim that the developer endorses this site.
The reference release checked for these articles is SpaceSniffer 2.2.0.27. The site avoids making unsupported claims about disk performance or deletion safety.
See the primary source list, Windows guides and download verification steps.
SpaceSniffer