Keywords: disk visualisation, disk usage, tree maps, free space

GrandPerspective is a small utility application for Mac OS X that graphically shows the disk usage within a file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space. It uses a so called tree map for visualisation. Each file is shown as a rectangle with an area proportional to the file's size. Files in the same folder appear together, but their placement is otherwise arbitrary.

Features:
- Disk usage visualisation by way of tree maps
- Configurable display of views
- Choice of color mapping schemes.
- Choice of color palettes
- Configurable mapping by file type
- Optionally view package contents
- Optionally view the entire volume
- Convenient navigation of views:
- Traverse up and down the folder hierarchy
- Select files and folders in the view
- Reveal files and folders in the Finder
- Delete files and folders from the view
- Filter files and folders
- Multiple view support
- Re-scan a view to compare results before and after clean-up
- Twin or duplicate a view for different displays of the same data
- Support for hard-linked files and folders
- Analyse Time Machine back-ups
- Save results of disk scanning operations
- Save images of views
- Configurable user preferences
- Snappy and responsive GUI
- Small memory and disk footprint
- Fully internationalized
- Extensive help documentation
- Available as a Universal Binary