justniffer is a TCP sniffer. It reassembles and reorders packets and displays the tcp flow in a customizable way. It can log network traffic in web server log format. It can also log network services performances (e.g. web server response times) and extract http content (images, html, scripts, etc)
LogMiner is a powerful log analysis package for Apache/IIS (or other web servers using the "combined" or Extended W3C log formats). It can extract and present statistics about visits, hits, traffic, navigation paths, browsers and OS's used by users.