Double Commander is an Open Source file manager with two panels side by side. The idea is based on Total Commander but with new and different features.Double Commander has a multi-rename tool, tabbed interface, custom columns, internal text editor, built-in file viewer, archive (ZIP, RAR) support, extended search function, configurable button bar, file operations logging, plug-in support, and much more

some key features
Internal text editor (F4) with syntax hightlighting
Built in file viewer (F3) to view files of in hex, binary or text format
Archives are handled like subdirectories. You can easily copy files to and from archives. Supported archive types: ZIP, TAR, GZ, BZ2, XZ, LZMA, 7Z and also RPM, CPIO, DEB, RAR, ZIPX
Extended search function with full text search in any files
Configurable button bar to start external programs or internal menu commands
Total Commander WCX, WDX, WFX and WLX plug-ins support

HomePage:

https://doublecmd.sourceforge.io/