W3Perl is a free logfile analyser, which can parse Web/FTP/Mail or Squid files. Most major web logfile formats are supported (Web : CLF/ECLF/NECLF on Unix, IIS/W3C on Microsoft ; Mail : Postfix/Sendmail/Exim), as well as split/compressed files. "Page tagging" is also supported if you do not have logfiles access. Output are spread over html pages, with graphics and sortable table. Stats can be run from a single command line or from a web browser.