KVR member ToneCarver released the beta of Harmony Rotator, a free midi harmonisation plugin.
“This is a MIDI only plugin – it does not create any sound. When it receives an input note it generates up to 4 output notes, one for each of the 4 “voices”. The output notes can be snapped to scale, delayed per voice, and are offset from the input note value according to the interval(s) defined for each voice. “
More info and download here: http://www.kvraudio.com/forum/viewtopic.php?t=322663