The best open source alternative to Double Commander is Files. If that doesn't suit you, our users have ranked more than 100 alternatives to Double Commander and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Double Commander are Spacedrive, Dolphin File Manager, Midnight Commander and Thunar.
Advanced Windows file manager offers tabbed browsing, dual-pane drag-and-drop, column navigation, built-in archive creation and extraction, file tagging, QuickLook previews, context menu integration, quick search, and customizable appearance for streamlined organization.
Open-source file explorer integrates cloud, local, and offline storage across devices using a secure virtual distributed filesystem in Rust, enabling unified management, file syncing, privacy control, intuitive interface, and ownership without centralized servers.
Usability-focused file manager for KDE desktops offering tabbed and dual-pane browsing, archive support, quick file renaming, filter-based searching, customizable icons, theme adaptation, preview modes, and extensibility with various service integrations.
Text-mode file manager for terminals with dual-pane interface enables copying, moving, deleting, and searching files locally or via remote shells. Includes internal viewer, text editor, subshell integration, broad terminal compatibility, and works over SSH.
Thunar is a modern file manager for the Xfce Desktop Environment. Thunar has been designed from the ground up to be fast and easy-to-use. Its user interface is clean, intuitive, and customizable. Thunar is fast and responsive with a good start up time and directory load time.
Terminal-based file manager offering a modern, customizable interface with split-screen panels, full keyboard shortcut support, fast file operations, offline access, privacy features, no ads, plugin extensibility, night mode, cross-platform compatibility, and open source code.
Explorer++ is a free file manager for Windows. Available on Windows XP and above, it features the same familiar interface as Windows Explorer, while introducing several enhancements and improvements for a much richer file browsing experience.
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:
It actually looks like the original Norton Commander.
Krusader is an advanced twin panel (commander style) file manager for KDE Plasma and other desktops in the *nix world.
Krusader is free/libre software and has tons of features for advanced users.
muCommander is a 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...).
it has awsome key shortcuts
Nemo is the official file manager for the Linux Mint operating system running the Cinnamon desktop. It re-introduced several features removed from the file manager Nautilus, from which it originated.
Brings iconic 3D Cover Flow file browsing to macOS, includes dual pane navigation, Quick Look integration, sidebar access to volumes, instant file sorting, context menus, type-ahead search, familiar Finder-like interface, and open source availability.
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Double-pane is not Files primary mode, but it does support it. Files has a lot less functionality and no focus on keyboard use-/accessibility.