doublecmd.sourceforge.io
Double Commander is a free cross platform open source file manager with two panels side by side. It is inspired by Total Commander and includes an internal text editor, a file viewer for hex, binary or text formats, archive handling, extended search with full text search, and support for Total Commander plug-ins. It offers FTP, FTPS, FTPES, SSH+SCP and SFTP protocols support, a multi-rename tool and a tabbed interface.