W3Perl is a free log file analyzer. It's a web analytic tool for Web, FTP, Squid, CUPS, DHCP, and Mail servers. It can use server's log files or your own (page tagging or counter). The perl scripts analyze log files and produce HTML or PDF reports. W3Perl can be run from the command line or from the web interface. Filters, display, and paths are stored in a configuration file. It includes incremental mode, don't need to reload the whole log file. Splitted or compressed log files, page tagging, and counter for external links.