Worker is described as 'File manager for the X Window System on UN*X with low requirements (basically only the X11 libraries). The directories and files are shown in two independent panels (similar to Midnight Commander)' and is a File Manager in the file management category. There are more than 50 alternatives to Worker for a variety of platforms, including Windows, Linux, Mac, BSD and Xfce apps. The best Worker alternative is Double Commander, which is both free and Open Source. Other great apps like Worker are Spacedrive, Total Commander, Dolphin File Manager and FreeCommander.
Open source, small and highly customizable twin-panel file manager for Linux with support for plug-ins. Main goal is to create easy to use and powerful file manager seamlessly integrated into Gnome desktop environment.
Paraguay
JumpFm is a minimalistic dual panel file manager (currently released only for Windows, Mac, and Linux) that lets you navigate your file system very efficiently.
Saladin is an open source dual-pane file manager for Windows which merges the capabilities of Windows Explorer with the well known and easy to use orthodox user interface.
Poland
EU
My Commander (MyCO) is "the smallest - smartest - fastest file manager in the world", for Windows. Small and smart, MyCO uses less of your computer's memory while it's running.
United States
Adds tabbed browsing to desktop windows, letting users drag, group, and organize application windows into tabbed sets for improved multitasking, navigation, and clutter reduction. Works with most Windows programs and supports both open source and original features.
UltraExplorer is a Windows Explorer replacement that will change the way you think about file management. Other Explorer replacement applications duplicate the same old paradigm introduced by Microsoft in Windows 95.
Metro Commander is an orthodox file manager which allows you to manage your files and folders from within the Modern Windows UI interface.
EstoniaEU
Nomad.NET is a powerful dual-pane file manager complete with breadcrumbs, thumbnails, integration with explorer plugins, and even support for multiple tabs.
Ukraine
Double-pane file manager extension for Emacs integrating dired mode, keyboard navigation, customizable keybindings, orthodox manager features, archive browsing, directory comparison, bookmarks, extensibility, and asynchronous operations across multiple platforms.
HiFile is the next evolution of file managers. Its mission is to boost your productivity every time you are working with your files or folders. It aims to be better in every aspect - more practical, more versatile, more efficient, more elegant, more customizable, more fun.
gentoo is a two-pane file manager for the X Window System. gentoo lets the user do (almost) all of the configuration and customizing from within the program itself. If you still prefer to hand-edit configuration files, they're fairly easy to work with since they are written...
