AirAudio is described as 'streams all audio from any app to every receiver' and is an app in the Audio & Music category. There are seven alternatives to AirAudio for a variety of platforms, including Windows, Linux, Android, Mac and iPhone. The best alternative is SoundWire, which is free. Other great apps like AirAudio are WiFi Audio Wireless Speaker (Free), Airfoil (Freemium), AirPlay (Free) and Stream What You Hear (Free, Open Source).
AirPlay lets you stream music throughout your entire house — wirelessly. AirPlay wireless technology will be fully integrated into speaker docks, AV receivers, and stereo systems from companies such as Bowers & Wilkins and Denon.