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WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
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.
TreeSize - TreeSize tells you where precious disk space has gone to.
ZetaWatch - Manage ZFS volumes in the menu bar
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
Drive Manager - Drive Manager has been written to help you easily identify drives which are of the same type.