Airfoil - This software is from the Rogue Amoeba company, built to run on Mac and Windows platforms. It’s an audio-based software that allows the computers sound to play over a network device. Read more about Airfoil.
AudioRelay - Listen to your PC audio, use your phone as a mic or stream audio from your phone
AirParrot - AirParrot is an interesting piece of software that allows you to view content from your Mac desktop through your television set if you have an Apple TV that can act as a bridge between the two devices. Read more about AirParrot.
SoundWire - SoundWire does audio mirroring (audio cast). You can use any music player on your PC or laptop like Spotify, YouTube, or iTunes and stream low-latency live sound over WiFi directly to your Android device.
AirServer - AirServer is a Mac and PC application that allows you to stream or mirror your Android device to your PC or Mac.
Stream What You Hear - Stream What You Hear.