I don't know about Total Commander because that appears to be Windows-only, but twin-pane "Commanders" (named after NC) do seem more popular in certain circles. They're still in wide use in Eastern Europe. Commanders have also influenced Dolphin, which has a built in twin-pane view (but it's not a commander because it lacks the typical keybinds) and there's a commander called Krusader that is a better fit.