Double Commander
Open Source
Double Commander is a cross platform open source file manager with two panels side by side.
Finder
Free
Finder is the default file manager and graphical user interface shell used on all Mac.
muCommander
Open Source
muCommander is a lightweight, open-source, cross-platform file manager that will run on any operating system supporting Java.
fman
Commercial
fman is a dual-pane file manager for Windows, macOS and Linux.
Compare Marlin with alternatives
Compare Double Commander and Marlin and decide which is most suitable for you.