TuneBlade
Commercial
TuneBlade is a software to stream audio to Airport Express, Apple TV, AirPlay compatible speakers and HiFi Receivers.
WiFi Audio Wireless Speaker is an android app to play music wirelessly.
AirMyPC
Commercial
AirMyPC is an Airplay Mirror Windows to AppleTV or ChromeCast.
Stream What You Hear
Open Source
Stream What You Hear is a Windows software to broadcast the sound of your computer.
Compare Airfoil with alternatives
Compare WiFi Audio Wireless Speaker and Airfoil and decide which is most suitable for you.
Compare Stream What You Hear and Airfoil and decide which is most suitable for you.