Finder is described as 'The Finder is the first thing that you see when your Mac finishes starting up. It opens automatically and stays open as you use other apps. It includes the Finder menu bar at the top of the screen and the desktop below that' and is a popular File Manager in the file management category. There are more than 100 alternatives to Finder for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet apps. The best Finder alternative is Double Commander, which is both free and Open Source. Other great apps like Finder are Files, Total Commander, Spacedrive and Dolphin File Manager.
This is by far the best alternative to finder available on Linux. They have very much in common including the view in columns, wich is the main hallmark for Finder.