Soundflower
Soundflower is a Mac OS X system extension that allows applications to pass audio to other applications.
Routes Windows application audio to and from your digital audio workstation software.
Synchronous Audio Router is a softwarebased audio routing driver for Windows. You can create any number of Windows audio endpoints, either playback or recording, and route them using any digital audio workstation software which supports ASIO, all with low latency. Even applications with no ability to select audio devices are supported using perapplication default device overrides.
low-latency audio-recording virtual-audio-cable
Soundflower is a Mac OS X system extension that allows applications to pass audio to other applications.
Free Open Source Mac OS X
Ever wanted to record your speaker output? (loopback) This is for you. It makes tinkering with the audio of each individual application much easier. As well as being able to loop-back.
Commercial Windows
JACK is a professional sound server daemon that provides real-time, low latency connections for both audio and MIDI data between applications that implement its API. It is often used with a frontend such as qjackctl.
Free Open Source Mac OS X Windows Linux
VB-Audio CABLE is a Windows Audio Driver working as a Virtual Audio Cable. After installing the VB-CABLE driver, a new playback device appears in the audio device list and can be set as default device.
Free Windows
Virtual sound card software to fix No Stereo Mix problem of Vista/Windows7. Support recording sounds from your computer, broadcasting audio files online and working as...
Commercial Windows