LiteDirStat
LiteDirStat is a version stripped down version of WinDirStat for ease of use.
WinDirStat is a disk usage statistics viewer and cleanup tool for MS Windows (all current variants). It shows disk, file and directory sizes in a treelist as well as graphically in a treemap, much like KDirStat and Sequoiaview.
All original source is copyright of WinDirStat Authors.