TuneBlade!

Send any audio to the AirPort Express. Send any audio to AirPort Express units, Apple TVs, and even other Macs and PCs, all in sync! Airfoil for Mac gives you your audio - everywhere.You can send audio to multiple outputs around your house, all in sync, and with Airfoil Speakers, you can turn any computer into a remote audio output.

SoundWire lets you send any music or audio ("what you hear now") from your Windows or Linux PC to your Android mobile devices. Use it as:- A remote speaker or wireless headphones- A way to listen to music and movies from your computer anywhere in your house or out on your deck.- A wireless extension of live audio from your PC-based music systemThe full version of SoundWire enables unlimited Opus audio compression, can handle up to 10 connections at the same time, and has no ads or interruptions. It also has a special Pro Mode to set and display buffer latency precisely in milliseconds. SoundWire does audio mirroring. You can use any music player on your PC or laptop like Spotify, YouTube, or iTunes and stream the live sound directly to your Android device. SoundWire lets you listen to the free version of Spotify on your phone. »

This App makes your Android device a wireless speaker.

Acoustic Bridge gives you the power to redirect audio from one PC to the speakers of another PC. This enables you to send the sound from a PC with your music collection to any other PC on your network. You could even visit friends and redirect your PC audio output to their PC and speakers. Use the best speakers available wherever you are.