logstash - logstash is a tool for managing events and logs.
Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
Matomo - Matomo is an open-source web analytics platform
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
Clicky - Clicky Web Analytics is a simple way to monitor, analyze, and react to your blog or web site's traffic in real time.