The Fred's Own Filemanager (fof) program is not, strictly speaking, a standard graphical filemanager. This is more a frontend to several Unix commands.
LLNL XDir provides a graphical user interface for drag-and-drop file transfer and for direct manipulation of local and remote directories.
moxfm is a Motif port of xfm.
A powerful and highly configurable Motif file manager with an Explorer-like user interface.