Moog Model D App. Currently Free! An easy to play simulation of a vintage Moog Synthesizer.
Korg Ikaossilator App. Also free! Normally $20. It’s a unique musical instrument/synth that uses Korg’s Kaoss pad.
This is a great free Guitar and Bass Tuner App by Fender
Here’s a Video on how to use it
Want Mike to stare at you while he drinks a glass of water? This is the link for you.