[jabirali]

It doesn't have to be though, there's just a high correlation between hard-to-automate apps and non-command-line apps. You can e.g. make a GUI app where every button or keybinding is bound to a named function (GUI Emacs comes to mind), and where those named functions can be used in scripts. Another option is to have a scriptable backend; LibreOffice has a terminal interface that lets you e.g. convert between document formats from a shell script, and Astroid Mail is built on Notmuch as its backend which is scriptable.

[foxdev]

Reaper has a billion actions you can assign to key combinations, and you can build your own toolbars from them. I think it's as close to a console application as I've seen a GUI get. It also has a scripting language you can use to make just about anything. GUI Emacs sounds like it probably influenced the Reaper people.