muCommander is a lightweight, cross-platform file manager featuring a Norton Commander style interface and running on any operating system with Java support (Mac OS X, Windows, Linux, *BSD, Solaris...).
Here's a non-exaustive list of what you'll find:
check Virtual filesystem with local volumes, FTP, SFTP, SMB, NFS, HTTP and Bonjour support
check Quickly copy, move, rename files, create directories, email files...
check Browse, create and uncompress ZIP, TAR, GZip, BZip2, ISO/NRG, AR/Deb and LST archives
check ZIP files can be modified on-the-fly, without having to recompress the whole archive
check Universal bookmarks and credentials manager
check Multiple windows support
check Full keyboard access
check Highly configurable
check Free Software
check Available in 18 languages : American & British English, French, German, Spanish, Czech, Simplified & Traditional Chinese, Polish, Hungarian, Russian, Slovenian, Romanian, Italian, Korean, Brazilian Portuguese, Dutch and Slovak