AudioRelay - Listen to your PC audio, use your phone as a mic or stream audio from your phone
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.
Porthole - Play all audio from your Mac through multiple AirPlay speakers at the same time. iOS 11 and macOS 10. 13 High Sierra both add multi-room AirPlay support to the operating sytem, making Porthole redundant.
AirPlay - AirPlay lets you stream music throughout your entire house — wirelessly.
AudioStreamer - AudioStreamer is a free web-based audio streamer which gives you easy access to your music.
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.