Daniel,
There probably isn't another one as it's a very niche market.
Remember as you become more proficient at editing / coding the need for the hints reduces. Also as software is getting better / cheaper as regards features verus price, once you have a decent post processor setup for that program the need to edit programs goes away.

I did a training day last year where at the start one of the items brought up by two of the guys was they had been told you could not run a machine without knowing G code.
I went from design to cut part on a Sieg KX3 machine, a con rod actually, with a piece of paper over the G Code window in Mach.
It was only after the part was cut and the paper removed that anyone saw the code that had produced the part.