Esben Stien wrote:
"Any free tools to transform voice? (controlling timbre, tone, formant,
reverberation, and pitch)."
I've found this collection of ladspa plugins useful:
http://quitte.de/dsp/pvoc.html
There is no seperate formant shifter, but the phase vocoding pitch
shifter works well on voice, and the exaggerate/accumulate sound rather
nice.