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.
G-Stomper Studio - G-Stomper Studio is a feature-packed, mobile music production tool.
CrispyTuner - Fully featured vocal tuning suite.
keezy - A colorful soundboard. Play with music.