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Personally, I've known about this program since its release (probably about 5 years ago). For those who don't know how the program works, I'll explain. As everyone knows, there are 255 skill trees for each hero. Using this program, you can determine the number of a skill tree and view it for the first few levels. Formally, it can't be called cheating, because the program doesn't take data from the current save file; it simply provides a way to visually browse the trees, making it easier to search through them.
However, there is one caveat. For the program to work, the game must be running, and a save file must be loaded (any arbitrary save file). This means that to use such a program during a game, you need to open a second instance of the game. Personally, this aspect raises questions for me regarding its legality, although the rules currently don't prohibit opening a second window.
Theoretically, I don't think there would be any difficulty in creating a version of the program that doesn't depend on the game being running.
As for my opinion on this program, I don't see anything wrong with browsing the 255 skill trees. If the program showed the current skill tree immediately, I don't think there would even be this question. Damage calculators and guard strength calculators are much more "cheaty," in my opinion.