GSnap - With GSnap you can get an auto-tune effect.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
keezy - A colorful soundboard. Play with music.
Antares Auto-Tune Pro - Auto-Tune Pro by Antares is the latest and enhanced version of Auto-Tune that offers Auto Mode to correct pitch and Graph Mode for step-by-step modifications of time and pitch.
Splice - Music creation, collaboration, and sharing made simple.