VAcard - [NOTE: You can download the application from ...
VB-Audio Virtual Cable - Connect Audio Applications together with a Virtual Audio Device
Soundflower - Soundflower is a Mac OS X system extension that allows applications to pass audio to other...
Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
Synchronous Audio Router - Routes Windows application audio to and from your digital audio workstation software.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!