GrandPerspective

GrandPerspective generates a graphic that displays in detail how the space on your hard drive or in a certain folder is being used.

Rather like DiskInventoryX, GrandPerspective can explore any of the subdirectories contained in a certain folder without having to scan everything.

In addition, you can create masks to show certain files depending on their size or file name extension.

You can also use color to organize the analysis results: by folder, top-level folder, extension, file name, depth, and so on.