It lets you change voice pitches and audio playback speeds of sound files.
CONVERT AUDIO FREE
It is a program that can change the voice pitch of an audio file.
Change your voice pitch and send out cute sound emotions in Skype call.
It can change your voice pitch to be male or female.
Blue Cat Audio
With the Blue Cat’s Chorus software you can simulate several voices.
Antares Audio Technologies
Auto-Tune EFX 2 is the easiest-to-use tool for real-time pitch correction.
Free Voice Changer which can turn the voice pitch up and down in 24 semitones.
Paul R. Harvey,Elevayta
Choir Boy is a real-time multi-voice pitch shifting plug-in.
Micro Technology Unlimited
Keyrite is a sofware tool that changes your voice pitch for your personal songs.
Screaming Bee Inc.
MorphVOX program can change your voice in realtime.
AlgorithmsAndDatastructures, F. Rudin
Learn to take over a pitch to your voice. Produce the same pitch with precision.
Chronotron Pro allows to change pitch without affecting temp and/or change tempo.
TFM Group 
FREE RealTime MP3 Mixing Machine with Pitch control,CrossFade control and more.
Elastique Pitch is a shifting solution for RTAS, VST, AU and AAX.
Seventh String Software
TransScribe Soft can change pitch and speed instantly .