awstats

Free real-time logfile analyzer to get advanced web statistics

AWStats is short for Advanced Web Statistics. It's a free tool that generates advanced web (but also ftp or mail) server statistics, graphically. This log analyzer works as a CGI or from command line and shows you all possible information that your logs contain, in a few graphical web pages. It uses a partial information file to be able to process large log files, often and quickly. It can analyze log files from IIS (W3C log format), Apache log files (NCSA combined/XLF/ELF log format or common/CLF log format), WebStar and most of all web, proxy, WAP, and streaming servers (and FTP servers or mail logs).