http://www.cd.chalmers.se/~hch/filerunner.html

FileRunner is a simple and efficient X11 file manager for Unix. It has built-in FTP support and is very configurable. It was created to ease you from the burden of typing thousands of ls, cd, mv, rm and cp in a day just to get your work done. The interface has been made as efficient as possible to be able to compete with the speed of command line usage.

List of nice features:

• Simple and powerful interface.
• History and Hotlist (bookmarks).
• Recursive directory menu of entire file system tree.
• Browse FTP directories as easy as normal directories.
• Copy FTP files/directories upload/download (recursive).
• FTP Delete (recursive), FTP Makedir, FTP Rename.
• Supports FTP through proxy.
• FTP resume download function.
• Rule based configuration of FTP site logins (password/user/proxy).
• FTP Asynchronous file transfer.
• FTP Cached directory listings.
• Asynchronous file operations.
• Built-in command shell windows
• Synchronized with file panels.
• These have history, aliases and file name completion.
• Extendable by adding your own command buttons.
• Very configurable.
• User defined file pattern / actions. (*.jpg → launch image viewer, etc ..)
• Distributed as Open Source under the GNU General Public License.

Knosciences uses an optimized .fr/config file for automatic application mime-type launch.