UnixTree - XTree-alike console mode filemanager for Unix and Linux systems. History, tips and tricks, guided tour. Freeware. - http://www.unixtree.org/
The NewSyslog Project - Newsyslog is a highly configurable program for managing and archiving log files (such as those produced by syslogd).[Unix or Unix-like system] - http://www.weird.com/~woods/projects/newsyslog.html
The Unix Cockpit - Open Source file manager for X11/Unix, runs under almost any Unix flavour. - http://www.klagges.com/uc.html
FLFM - Fast Light File Manager. A small graphical file manager for X-Windows based on the FLTK library. Xdnd 4 compatible. GPL. - http://oksid.ch/flfm
Ytree - A Unix (curses-based) file manager similar to DOS Xtree for browsing filesystems and archives. Open Source. - http://www.han.de/~werner/ytree.html
KNC - Graphical 2 windows file manager for KDE. Download source. - http://software.freepage.de/stormer/
KCommander - Linux Windows Commander style filemanager. Open Source. - http://www.kcommander.org/
CLEX File Manager - Text based file manager for UNIX systems. Free source code distribution. - http://www.clex.sk/