Big Files Finder is described as 'Disk space analyzer' and is an app in the OS & Utilities category. There are three alternatives to Big Files Finder for Mac, Windows and Electron / Atom Shell. The best alternative is DaisyDisk. It's not free, so if you're looking for a free alternative, you could try OmniDiskSweeper or Space Radar.
With DaisyDisk you can free up disk space by quickly finding and deleting big, useless files. The program scans any mounted disk and displays it on the sunburst map, where segments mean files and folders, proportionally to their sizes. The map is easy to read and navigate.
OmniDiskSweeper is a Mac OS X utility for quickly finding and deleting big, useless files and making space on your hard disks. OmniDiskSweeper scans your disks and highlights the biggest files, so you can determine what's using up your disk space.