SoundWire, AudioRelay, AirParrot, Sound Control, WiFi Audio Wireless Speaker, Stream What You Hear, TuneBlade, AirPlay, Stardock Acoustic Bridge, AirAudio, Soundfly, AirMyPC, Mkchromecast, SpeakerShare, MKMirror, Share Speaker Player, WiFi2HiFi, StreamToMe, Chromecast Audio Stream, Porthole, RaopX, oAEP are some alternatives to Airfoil.