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.
Soundflower - Soundflower is a Mac OS X system extension that allows applications to pass audio to other...
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.