Hi all,
In this topic, integration of a DAAP server in Subsonic was requested. Since this request was never fulfilled, I started working on an alternative.
Yesterday I released SubDaap v2.0.0, which provides a DAAP server that connects Subsonic with iTunes. Features include full-catalog browsing, playlists and local file caching. I have tested this version under OS X 10.10 and Ubuntu 15.04 in combination with iTunes 12.
The installation instructions can be found in the README.md file. Note that this is a background service and does not provide a graphical interface (except a web interface page). It is designed to run on the same machine as iTunes, so you have offline access to your music. However, it can also run on a remote network server.
At this moment only a few users make use SubDaap, and more testing is needed. Please let me know if you find any bugs.