FL Studio - Image-Line's FL Studio, now on it's 12th version, is a well-known music production suite and the most popular beat processor on the market, due no doubt to its longevity. Read more about FL Studio.
Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
Reaper - Reaper is a focused digital audio workstation (DAW) developed by Cockos. In the creation of the software, the digital audio technology company intended to make audio editing accessible to the masses.
CrispyTuner - Fully featured vocal tuning suite.