Not sure if harmoniser is a word, but i like that this tool lets you create a colour harmony form just point and click in the buttons under the wheel
mono, ocntrast, triadic, tetrad, analogical
Faber Birrren would love this, just like j m brockman would have loved grid-designer-tool.
Creating instant colour hamrines for you in a second wasn't enough you can decide upon the subtle nuances of the triad, tetrad and analogical with the degrees between,
Will have to try see version 3 as it isn't supported on IE6 but version 2 is supported on IE6 which is the one shown.
I have seen other good colour pickers that give a scheme and the hex codes but the harmony buttons and subtle nuances so easily manipulable, god this is good, easy, simple.