Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
n-Track Studio - Audio recording and music creation app for iOS.
CrispyTuner - Fully featured vocal tuning suite.
Voxal - Modify your voice in any application that uses a microphone. From girl to alien, the voice options for online video games, avatars and podcasts are limitless.
TalentedHack - A Pitch Correction LV2 plugin derived from Autotalent