Subsonic - Subsonic is a free, web-based media streamer, providing ubiquitous access to your music and video.
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.
Ampache - Web ( HTTP centralized ) based audio/video streaming application
AudioRelay - Listen to your PC audio, use your phone as a mic or stream audio from your phone
Airsonic - Airsonic is a Free and Open Source community driven media server which allows you to stream...
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.