I'll add a +1 to Total Commander. That tool along with several others REALLY make a large difference in day-to-day computer work.

I'll add these to the list:

* Clipmate. The BEST clipboard database.

* Evernote.

* AutoHotkey. Seriously, play with this a bit and you will see uses all OVER The place.

* Midnight Commander for Linux installs. Makes it a LOT harder to shoot yourself in the foot as well.

Norton Commander was great. Simple, fast, powerful. I often wonder why Finder/Explorer don't borrow from it.

FAR Manager back in the Win2k/XP days. Actually nowadays too.

I preferred PCTools, back then.

I miss Norton Commander!

Have you already checked out Midnight Commander? https://en.wikipedia.org/wiki/Midnight_Commander