LogValidator is a perl open source tool which performs step-by-step log analysis and quality checking for web sites.
Olivier Théreaux has released maintenance version (1.3.1) removing the dependency on the SOAP::Lite module. Automatic installation through CPAN is broken at the moment.
LogValidator has a modular architecture. You can create your own module for checking and maintaining the quality of your Web site. Your module contributions are welcome. Contact us.