Double Commander is a free and open-source file manager for Windows, macOS, and Linux. It[SQ]s inspired by the Total Commander file manager and features a dual-pane interface. This means you can see two file directories simultaneously, making it very efficient for tasks like copying, moving, and comparing files between folders.

Key features of Double Commander include :

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Dual-pane interface:

The core feature, allowing for easy file management between two locations.
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Tabbed interface:

You can have multiple folders open in tabs within each pane.
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Built-in archive support:

Handles various archive formats (ZIP, 7Z, RAR, etc.) without needing external programs.
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Plugin support:

Extensibility through plugins for added functionality.
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File comparison:

Easily compare files and folders.
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Multi-lingual support:

Available in numerous languages.
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Customization:

Highly customizable with themes and settings.
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Multiple selection:

Efficiently select and manage multiple files.
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FTP/SFTP support:

Connect to remote servers.
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Portable version:

Available as a portable app, eliminating installation needs.

In short, Double Commander is a powerful and versatile file manager ideal for users who want a more advanced and efficient alternative to basic file explorers. It[SQ]s particularly useful for those who frequently work with multiple folders and files.