I think mc (Midnight Commander) is still one of the best TUIs available - it's very close in capability to the GUI versions (like Double Commander) and it has the benefits of tuis - like that you can run it on a remote system.
It looks outdated, but I'm actually now working on a new skin that will hopefully be included in the next release of mc.
I had mc on my $20 second hand 286, there are some newer takes on the classic, ranger and nnn come to mind, support for images on the terminal with sixel is pretty neat!
