Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
Adobe Audition - Mix, edit, and create audio content in Adobe Audition CC with a comprehensive toolset that includes multitrack, waveform, and spectral display.
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
CrispyTuner - Fully featured vocal tuning suite.