If you're not a big fan of the Finder in MacOS, you definitely have to take a look at muCommander, it's a free lightweight, cross-platform file manager with a dual-pane interface. It runs on any operating system with Java support (Mac OS X, Windows, Linux, *BSD, Solaris...).
Here's a non-exhaustive list of what you'll find:
- Virtual filesystem with support for local volumes, FTP, SFTP, SMB, NFS, HTTP, Amazon S3, Hadoop HDFS and Bonjour
- Quickly copy, move, rename files, create directories, email files...
- Browse, create and uncompress ZIP, RAR, 7z, 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
- Tabbed navigation
- Universal bookmarks and credentials manager
- Multiple windows support
- Full keyboard access check Highly configurable
- Available in 27 languages : American & British English, French, German, Spanish, Czech, Simplified & Traditional Chinese, Polish, Hungarian, Russian, Slovenian, Romanian, Italian, Korean, Brazilian Portuguese, Dutch, Slovak, Japanese, Swedish, Danish, Ukrainian, Arabic, Turkish, Catalan, Belarusian and Norwegian.
- Free Software (GPL)

Download muCommander