FatFileFinder is described as 'Electron app for finding large files on your filesystem' and is an app in the OS & Utilities category. There are four alternatives to FatFileFinder for Windows, Linux, Mac and PortableApps.com. The best alternative is WizTree. It's not free, so if you're looking for a free alternative, you could try Disk Space Saver or Large Files Finder.
WizTree scans your entire hard drive and shows you which files and folders are using the most disk space. It does this VERY QUICKLY. In fact, we believe WizTree to be the fastest application of this type currently available!
TreeSize Professional tells you where precious disk space has gone to. It can be started from the context menu of a local folder or a local drive and displays the size of each folder, including its subfolders.
Large Files Finder will help you to instantly find and delete large files that occupy your hard drive on Windows, Mac, and Linux. This tiny, flexible, hard-working tool free ups gigabytes of wasted disk space in a simple click.