Ask HN: Which Linux CLI apps could use a GUI app?

A probably better question would be "Which Linux CLI apps NEED a GUI app?"

Certainly many do, but certainly many don't as it would either reduce their usefulness, or not improve them at all.

Then again, go ahead and produce a GUI interface for them. If the GUI interface is used, well and good. If the GUI interface isn't used, then let those GUI front-ends die.