DaisyDisk Alternatives

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

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

Open Source

TreeSize tells you where precious disk space has gone to.

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.

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

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

Clean, protect and speed up your Mac

Find and clean out all your old unused files

Baobab Disk Usage Analyzer is one of the light-weight disk analyzers that offers you a chance to view and monitor the disk usage & folder structure without any hassle.

Distributor of workload automation, financial statement reporting, data access, IT Asset Management and Service Desk software solutions.

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

Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).

Filelight is an application to visualize the disk usage on your computer.