Super Sound - Super Sound is a resourceful audio and music editor.
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.
Add Audio to Video - Add Audio to Video empowers you to add custom audio tracks to your video files.
Splice - Music creation, collaboration, and sharing made simple.