Relax is a free, multi-platform web server log analyzer for tracking which search engines, search keywords and referring URLs led visitors to the web site. Frequently updated parser module recognizes hundreds of search engines.

Blue dot is a free GPL licensed Perl CGI tracking and web site activity measurement script which generates Apache combined style access log files. These log files can be analyzed with most standard log analysis tools.

Relax for Windows is a free, web server log analyzer that tracks which search engines, search keywords and referring URLs led visitors to the web site. Frequently updated parser module recognizes hundreds of search engines.