GrandPerspective

GrandPerspective is capable of generating a detailed, graphic representation of the space files occupy on your hard drive or in specific folders.

Just like with DiskInventoryX, GrandPerspective lets you explore subdirectories inside a folder without having to scan the entire hard drive all over again.

In addition, you can use filters and mask files so you only see certain files according to their size, extension, or name.

You can also use color to organize the analysis results by folder, parent folder, extension, name, creation time, etc.