SpaceMonger - SpaceMonger helps you understand what's occupying your hard drive and more effectively clean it up without worrying about losing anything important in the process.
Drive Manager - Drive Manager has been written to help you easily identify drives which are of the same type.
Stats - Simple macOS system monitor in your menu bar.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Time Machine - Time Machine is the breakthrough automatic backup that’s built right into Mac OS X.
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.