or whatever you wanna call it………………..they call it: JDiskReport
JDiskReport is basicly very similar to Disk Inventory X, Whatsize and GrandPerspective, it displays your hdd usage in a graphical way. Great idea to locate big-files.
About the project:
JDiskReport enables you to understand how much space the files and directories consume on your disk drives, and it helps you find obsolete files and folders.
The tool analyses your disk drives and collects several statistics which you can view as overview charts and details tables.
This is ad-free uncrippled no-charge binary multi-platform software that never expires.
Get more informations from the feature-list
Download here
Last note: JDiskReport is based on ? Lets guess …… Java 
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as Disk Iventory X is not longer being developed i have searched for a real alternative application. Guess i found it with GrandPerspective
Quote from the project page:
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.
Preview:

Why another app like that ? Answer from the dev:
So, why GrandPerspective? Well, as you may have guessed it’s a fun little coding project and I needed to pick something to code on my new Mac Mini. Having said that, it does have a few things going for it. Firstly, GrandPerspective is developed specifically for Mac OS X, which narrows the immediate competition down to Disk Inventory X, as far as I’m aware. Secondly, GrandPerspective has its own way of visualising directory trees. The layout algorithm that is used is simple and effective, but novel to the best of my knowledge. Also, the file rectangles are drawn to be as clear and unobtrusive as possible. Whether you like it or not is a matter of taste, but you’ve got a choice. Thirdly, GrandPerspective will intentionally be kept as basic as possible. It should do one thing only, and do it well. That means it is a lean and mean application. GrandPerspective’s memory requirements and the size it occupies on disk are pretty minimal. For those concerned about disk space, the latter must count for something, right? Finally, it has a cute logo that will enhance anyone’s Dock.
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I just found an application called WhatSize. Basicly you can see Whatsize as alternative for DiskInventoryX
System Requirements
- Mac OS X v10.3.9 or later

Versiontracker’s description:
WhatSize is a simple tool that allows the user to quickly measure the size in bytes of a given folder and all subfolders and files within it. You would be surprised at how many useless files might be laying around on your hard disks. The files and folders are automatically sorted by size, with the biggest sizes first.
While the app is measuring a folder the user can browse the files within that folder and immediately see the size in bytes. Hidden files, cache files, directories will all show up with their corresponding size. This application is similar to the ancient NeXTSTEP, DarkForest.
Once the measuring of a folder has ended the user can also view the information by filtering for particular file sizes or types. The user can also move unwanted files and folder in the corresponding Trash bin similar to the Finder’s Delete button.
Finally another interesting ,app
Best regards
fidel
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