Using Openfire (Jabber Server) in FreeNAS
The Life’s Like That blog has a post about using Openfire (Jabber) server
The guidelines are for FreeNAS 0.69 series which is based on BSD 6.4. The author notes that there might be differences for the FreeNAS 0.7 series as that is based on FreeNAS 7.
Life’s like that: Openfire in FreeNAS (Freebsd Based)