MuCommander is a powerful, cross-platform file manager
We've covered many, many Explorer replacements here in the past, so I was a little surprised that MuCommander hadn't been written up yet.
What makes MuCommander stand out is that it is free, open source, and cross-platform. The author's web site provides downloads for Windows, Mac, and Linux (.tar.gz) as well as a Debian package, portable version, and a Java Web Start package.
It's actually the first JWS application I've come across since I started reviewing for Download Squad. It loaded fairly quickly on my netbook, and ridiculously fast on my quad-core AMD desktop.
MuCommander presents a skinnable, dual-pane view for file management. There's no tab support, though I don't consider that a major shortcoming - especially considering its other features are numerous, and extremely useful.
For starters, there's built-in support for FTP, SFTP, Samba, HTTP, NFS, and Bonjour. Several types of archives can be explored without extracting: zip, rar, tar, gzip, bzip2, iso, nrg, deb, and lst. MuCommander can create archives (press ctrl+I to pack) and even modify zip files on the fly without having to recompress the entire archive
There's also a command shell window with scrolling output, credential manager, and favorite locations list.
MuCommander is a fantastic file manager, and well worth a test drive for any user - regardless of OS.