Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.
Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
keezy - A colorful soundboard. Play with music.
JACK Audio Connection Kit - JACK Audio Connection Kit|Home