SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
keezy - A colorful soundboard. Play with music.
TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
Splice - Music creation, collaboration, and sharing made simple.
Radium - Radium is a music editor with a new type of interface.