A free program for Android, by Play-Fi.

DTS Play-Fi is a free app for devices that allows you to stream music over Wi-Fi to your home audio system, whether that is a Wi-Fi router or an authorized DTS Play-Fi product. With this app, you can enjoy your favorite tunes all through the house, regardless of where you are in the room.

It is a very simple app to use. The first step is to make sure that your Wi-Fi network is enabled and that you have a Wi-Fi connection. Next, select the audio device you want to stream to and select the music or audio file you want to play.