Autotalent Free Autotune VST Plugin
Autotalent by Oli Larkin is a great real-time pitch correction auto-tune VST plugin. The Autotalent plugin ensures that only the specified notes are hit. Use this auto-tune VST plugin to make Cher-like vocal effects, or use it as a simple pitch shifting / pitch correction audio effect. You might have to disable multiprocessor support in your vst host for it to work.
Download Autotalent Free Autotune VST Plugin