referer-inspect
The referer utility helps keeping track of who links to your site and how people are redirected to your website. The gather tool inspects and analyses the Apache logfile and reports referers that don't refer to the same site into an SQL database. This is called for every site you are interested in.
A small PHP application is used to visualise the data stored in the database.
Synopsis
referer-inspect --site|-s sitename --logfile|-l logfile
This command analyses the named logfile for the given site and stores external referers into the database.
Program Code
The program is written in Perl using Getopt::Long, LWP::UserAgent and DBI. It should run without problems on any GNU/Linux, BSD and Unix systems.