GSnap - With GSnap you can get an auto-tune effect.
keezy - A colorful soundboard. Play with music.
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.
CrispyTuner - Fully featured vocal tuning suite.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.