Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
iFree Skype Recorder - iFree Skype Recorder is a powerful and easy-to-use tool for recording Skype voice conversations.
GSnap - With GSnap you can get an auto-tune effect.
Call Recorder - Record Mac Skype Calls - Automatically record and save call audio and video on your Mac.
Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
Voicemod - What are the voice changers? How do these work? Are these illegal? What is a soundboard? Find all the answers here. Voicemod - The Best FREE Voice Changer