Marcus Curtis

 

Case not closed, 

The OP has already acknowledged, case closed. Quite clearly the OP was not interested in simple pitch shifting, that's why he used the phrase "true harmonizer" instead of using the phrase "pitch-shifter". This has been common terminology for decades now. You can continue extolling the virtues of a pitch shifter and how useful static octaves or fourths are in terms of "harmony" all you like but I have no interest in discussing semantics when it is obvious what the OP was asking and that he received the answer he was looking for.

Amplitube has one. You can download Amplitube free and demo the harmonizer for a day or so. I have done that a couple of times as it is fun to play with. But you have to wait a month (I think) before you can try it again. If I remember correctly, it is pretty inexpensive.