Package shairport-sync

AirTunes emulator. Multi-Room with Audio Synchronisation

https://github.com/mikebrady/shairport-sync

Shairport Sync emulates an AirPort Express for the purpose of streaming audio
 from iTunes, iPods, iPhones, iPads and AppleTVs. Audio played by a Shairport
 Sync-powered device stays synchronised with the source and hence with similar
 devices playing the same source. Thus, for example, synchronised multi-room
 audio is possible without difficulty. (Hence the name Shairport Sync, BTW.)

Shairport Sync does not support AirPlay video or photo streaming.
Miscellanea
Name Description
shairport-sync Synchronised Audio Player for iTunes / AirPlay