StatCounter - StatCounter is a simple but powerful real-time web analytics service that helps you track, analyse and understand your visitors so you can make good decisions to become more successful online.
logstash - logstash is a tool for managing events and logs.
AFSAnalytics - AFSAnalytics.
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
Woopra - Track your customers' web and mobile activity, forms, emails, support tickets and more, all in one place with customer analytics. Analyze and take action.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.