Baobab Alternatives

SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.

WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.

Open Source

WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.

TreeSize tells you where precious disk space has gone to.

JDiskReport enables you to understand how much space the files and directories consume on your disk...

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.

Disk Inventory X is an open source disk space analyzer and disk management tool for the Mac OS X operating systems that allow the OS X users to check for the availability of free space in their machines.

free

DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.

paid Free Trial $9.99 / One-off

OmniDiskSweeper is a tool to free up the hard disk space by detecting the large files and folders.

TreeSize Professional is a robust Graphical Manager developed by JAM Software to help you perform different operations on your storage systems like analyzing the data, organizing and freeing up the storage system effectively, and viewing the usage.

GrandPerspective is a small utility application for Mac that graphically shows the disk usage...

DiskAnalyzer Pro is a hard disk management and usage analyzer that assist the Windows users in locating the hard disk space that is being captured by the unwanted files and folders.

1Tree is a useful application that makes it easy for you to navigate your hard drives and take various actions on folders and files like copying, deleting, or moving them.