Hi
Something I use a lot.
Total Commander
Total Commander download (beta) page.

Total Commander 8.50 download page.

•Two file windows side by side
•Multiple language and Unicode support
•Enhanced search function
•Compare files (now with editor) / synchronize directories
•Quick View panel with bitmap display
•ZIP, ARJ, LZH, RAR, UC2, TAR, GZ, CAB, ACE archive handling + plugins
•Built-in FTP client with FXP (server to server) and HTTP proxy support
•Parallel port link, multi-rename tool
•Tabbed interface, regular expressions, history+favorites buttons
•Thumbnails view, custom columns, enhanced search
•Compare editor, cursor in lister, separate trees, logging, enhanced overwrite dialog etc.
•Unicode names almost everywhere, long names (>259 characters), password manager for ftp and plugins, synchronize empty dirs, 64 bit context menu, quick file filter (Ctrl+S)
•USB port connection via special direct transfer cable, partial branch view (Ctrl+Shift+B), and many improvements to ftp, synchronizing and other functions
•And many more!