Far Manager vs Multi Commander

Far Manager's interface encourages keyboard operation - all actions are easily accessible with keyboard shortcuts, you can quickly record macros for any repeatable action, there are no screen redraws if it is not necessary and that makes everything faster.

Released under BSD license.

There are may of them, and you can write them in any languages, including Python.

Every Far feature is also true for its editor. You can setup an external editor if you like, but the included editor works really well and features syntax highlighting.

Hit "Ctrl-." and start recording your boring sequence. Hit "Ctrl-." again to assign it a key. You can use Lua if you need more advanced macros.

E.g. readme-9.txt before readme-10.txt

Just press F1 when you need it. No internet connection or browser is required.

Fully themeable, allowing you to change the colors of every part of the interface.

Including optional background coloring.
Limitation of this pro: text and background color cannot be taken from 2 different filters and thus combined but on the positive side: it provides coloring profiles, which can be switched (supposedly easily).

A hundred different options: multi-rename, convert line break of files (CR, LF, CRLF), double panel, folder tree, tabbed interface, colourized tabs, etc.

Besides many customizable on-board options and features, one can also write his/her own scripts and even full plug-ins.

The program launches fast.

You can easily write powerful scripts even without knowledge of programming.