Because the source code size is too heavy, the binaries (artica-*) sources code are separated from the release package
The web interface is in PHP, so you will find the php code in main package in download section
artica-20111101-fpc.tgz release November Tuesday 01 01:17:37 (11 Mb)artica-20110101-fpc.tgz release January Saturday 01 05:47:38 (22 Mb)artica-20091229-fpc.tgz release December Tuesday 29 13:43:33 (22 Mb)artica-20081215-fpc.tgz release December Monday 15 17:54:58 (18 Mb)artica-20110601-fpc.tgz release June Wednesday 01 00:44:22 (22 Mb)