Piano Visualizer - Bring your piano music to life with this application.
MIDI Visualizer - Small cross-platform MIDI visualizer written in C++/OpenGL
Piano Connect - Piano Connect is one of the most popular piano learning apps that helps you play piano on your smartphone anywhere at any time.
Chordana Play for Piano - Chordana Play for Piano is an app that allows you to learn piano with any MIDI-supported keyboard or the actual MIDI piano.
MIDITrail - "MIDITrail" is a MIDI player which provides 3D visualization of MIDI datasets.
My Piano - My piano is an app that allows you to learn piano with a virtual on-screen keyboard.