Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
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.
Sound Control - App-specific volume control
AudioRelay - Listen to your PC audio, use your phone as a mic or stream audio from your phone
Volume Scroll - Volume Scroll lets you control your main volume by hovering with your mouse cursor over the top...
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.