Forklift!

Double Commander is a cross platform open source file manager with two panels side by side. It is inspired by Total Commander and features some new ideas.

Cyberduck is an open source FTP client.

GNU Midnight Commander is a visual file manager, licensed under GNU General Public License and therefore qualifies as Free Software. Its a feature rich full-screen text mode application that allows you to copy, move and delete files and whole directory trees, search for files and run commands in the subshell. Internal viewer and editor are included.

XYplorer is a file manager for Windows. It features tabbed browsing, a powerful file search, a versatile preview, a highly customizable interface, optional dual pane, scripting engine, and a large array of unique ways to efficiently automate frequently recurring tasks. It’s fast, light, and portable.

Nautilus (Files) is a file manager designed to fit the Gnome desktop design and behaviour, giving the user a simple way to navigate and manage its files.

Q-Dir makes your files and folder easy to manage. Fast and easy access, with an amazing Quadro-View (4 panes) technique. You dont have to renounce the usual, Drag and Drop, all Views, and other functions of your system. No! Q-Dir gives you other nice functions, that make you happy. One can save many hand moves and also time!

Dolphin is a file manager for KDE focusing on usability. Has three view modes: Icon, Detail and it used to have Column View like in Finder (it is not available in current version due to problems with maintaibility). Supports FTP, SCP and other protocols. Highly configurable.

Multi Commander has a lot of file manager features. This list It is not even close to complete. There are so many features and tweaks in Multi Commander that not everything can be listed here.

Far Manager is a program for managing files and archives in Windows operating systems. Far Manager works in text mode and provides a simple and intuitive interface for performing most of the necessary actions:

FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.