The Linux Mint fork of Nautilus 3.4 that is the default file manager for the Cinnamon desktop environment.
Dolphin file manager is the default file manager for KDE.
Ranger is a text based file manager that works inside of a terminal emulator.
Nautilus is the default file manger for Gnome Shell that is currently going by the name of Gnome Files.
Midnight Commander is a cross platform file manager and a clone of Norton Commander.
PCManFM is the default file manager for the LXDE desktop.
Pantheon Files is the default file manager for elementary OS.
The MATE desktop fork of Nautilus.
ncurses file manager
SpaceFM is a fork of PCManFM that was created to be more customizable than PCManFM.
Multi-platform open source file manager.
Worker is a two-pane file manager for the X Window System on UN*X.