WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
ncdu - A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you...
Disk Space Pro - Scans your home folder and reports folders and file disk space use.
TreeSize - TreeSize tells you where precious disk space has gone to.
Filelight - Filelight is an application to visualize the disk usage on your computer.
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.