Although I am currently maintaining FFTease by myself, the software was originally created as a collaboration with Christopher Penrose in 1999. It is based on non-realtime spectral processing software that we developed on the NeXT computer starting in the late 1980s.
Cheers,
Eric
fftease covers most popular spectral manipulation goodies. Originally
by Eric Lyon and ported to pd by Thomas Grill, IIRC.