VoDi (Voice Disguise) 3

VoDi (Voice Disguise) 3 offers you such an effective audio plugin that it changes your voice instantaneously. It is a tool for modifying pitch, timbre, duration, and adding audio effects. It is fully integrated with voice chat programs such as Skype and MSN Messenger.

Vodi supports independent pitch and timbre modification in the real sense as opposed to other software tools for voice modification: you can hold the pitch constant and modify the timbre and vice versa, or you can modify them independently in desired amounts.