If you use zsh, there is deer[0], which has ranger like navigation and some useful features, but starts up instantaneously, unlike ranger. Great for quickly moving around complex directories structures.

0. https://github.com/Vifon/deer

There was a massive pile left out in favor of talking up multiple KDE ones. And at least Konqueror and Dolphin would only be considered "to try" if you have had your head in the Fedora/RHEL sand for way too long.

There is Spacefm, a fork of Pcmanfm that can do mounts etc without the involvement of Freedesktop parts.

And if one is to focus on "traditional" (dual column) managers, where is emelFM2?