Baobab
Open Source
Baobab is a disk usage analyzer is a graphical disk usage analyzer for GNOME.
ncdu
Open Source
ncdu (NCurses Disk Usage) is a disk utility for Unix systems.
JDiskReport
Free
JDiskReport enables you to understand how much space the files and directories consume on your disk drives, and it helps you find obsolete files and folders.
Filelight
Open Source
Filelight is a KDE graphical disk usage analyzer, part of the KDE Utils package.
Compare DiskUsage with alternatives
Compare JDiskReport and DiskUsage and decide which is most suitable for you.
Compare Filelight and DiskUsage and decide which is most suitable for you.