Piano Visualizer - Bring your piano music to life with this application.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
MIDITrail - "MIDITrail" is a MIDI player which provides 3D visualization of MIDI datasets.
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under 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.
Amarok - The Amarok team is proud to announce the immediate availability of the result of 2 years of hard work, the beta release of Amarok 2. 9. This release is marked by improvements, corrections and polishing of nearly all Amarok features.