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.
Vinyl Music Player - A fork of Phonograph Music Player that "makes all Pro features free, as they used to be".
AudioRelay - Listen to your PC audio, use your phone as a mic or stream audio from your phone
RockPlayer - RockPlayer is a video player that supports nearly all formats.
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.
VPlayer - VPlayer - a free music player for VKontakte.