Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
CrispyTuner - Fully featured vocal tuning suite.
Radium - Radium is a music editor with a new type of interface.