Virtual Audio Cable!

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. VB-CABLE can be set as the default device, just like any regular audio device. The Configure and Properties buttons allow to setup multi-channel features and device sound quality. All signal coming in the CABLE input is going to the CABLE output. This makes it simple to record the audio stream using some other application. »

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.

Soundflower is a Mac OS X system extension that allows applications to pass audio to other applications. Soundflower is easy to use, it simply presents itself as an audio device, allowing any audio application to send and receive audio with no other support needed. Soundflower is free, open-source, and runs on Mac Intel and PPC computers.

Suddenly, it's easy to pass audio between applications on your Mac. Create virtual audio devices to take the sound from applications and audio input devices, then send it to audio processing applications. Loopback gives you the power of a high-end studio mixing board, right inside your computer!

With Audiobus, the revolutionary new inter-app audio routing system, you can connect your Audiobus-compatible music apps together, just like virtual cables.

Carla is an audio plugin host, with support for many audio drivers and plugin formats. It has some nice features like automation of parameters via MIDI CC (and send output back as MIDI too) and full OSC control.

virtual-audio-capture-grabber-device is an audio capture device allowing you to capture all the "wave out sound" that is playing on your speakers (i.e. record what you hear) for Windows 7/Vista.

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 Vista/Windows 7 Audio Changer software..

[NOTE: You can download the application from http://www2012.barix.com/downloads/Software_tools/221 ]

Vsound a virtual audio loopback cable - Vsound is an application which allows you to digitally record the output of another program such as RealPlayer. The recorded output can be saved to a WAV file or can be piped into another program such as an MP3 encoder.

iShowU Audio Capture is an extension to OS X used by iShowU Studio and iShowU Instant to record audio from your computer. This new-and-improved audio driver replaces Soundflower and provides a bunch of new features and improvements in order to make recording audio more stable and easy to do.

Synchronous Audio Router is a software-based 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 per-application default device overrides.