iTunes-compatible DAAP server
Firefly Media Server (formerly mt-daapd) is an open-source audio media server (or daemon) for the Roku SoundBridge and iTunes. It serves media files using Roku Server Protocol (RSP) and Digital Audio Access Protocol (DAAP).
http://en.wikipedia.org/wiki/Firefly_Media_Server
For Debian users:
https://packages.qa.debian.org/m/mt-daapd.html
https://tracker.debian.org/pkg/mt-daapd
For FreeBSD users:
http://home.introweb.nl/d/dodger/itunesserver.html...