Web Tools
Analysing web browsing behaviour
If your empirical study includes the analysis of web browsing behaviour, you might be interested in using SCONE, "which was designed to allow the quick development and evaluation of new Web enhancements for research and educational purposes".
Related links
Testbed for metrics of website usage
The National Institute of Standards and Technology (NIST) provides a so called Web Metrics Testbed. It contains a set of tools to analyse the usability of websites.