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.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
AudioRelay - Listen to your PC audio, use your phone as a mic or stream audio from your phone
foobar2000 - An advanced freeware audio player for the Windows platform.
Stream What You Hear - Stream What You Hear.
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.