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-20100120-fpc.tgz release January Wednesday 20 10:40:56 (22 Mb)artica-20100104-fpc.tgz release January Tuesday 05 11:25:10 (22 Mb)artica-20100128-fpc.tgz release January Thursday 28 14:07:11 (22 Mb)artica-20100118-fpc.tgz release January Monday 18 11:32:55 (22 Mb)artica-20091229-fpc.tgz release December Tuesday 29 13:43:33 (22 Mb)artica-20090928-fpc.tgz release September Monday 28 10:43:30 (22 Mb)artica-20091123-fpc.tgz release November Monday 23 11:07:11 (22 Mb)artica-20090831-fpc.tgz release August Monday 31 15:56:43 (21 Mb)artica-20090727-fpc.tgz release July Monday 27 15:31:16 (21 Mb)artica-20081215-fpc.tgz release December Monday 15 17:54:58 (18 Mb)artica-20090705-fpc.tgz release July Sunday 05 20:30:57 (21 Mb)