GSnap - With GSnap you can get an auto-tune effect.
x42-Autotune - An autotune implementation in x42 plugin pack
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.
CrispyTuner - Fully featured vocal tuning suite.
Autotalent - To make music