GSnap - With GSnap you can get an auto-tune effect.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
keezy - A colorful soundboard. Play with music.
Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
Splice - Music creation, collaboration, and sharing made simple.