Analytics: Piwik, Clicky

Piwik:
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Piwik does not have Event Tracking

http://piwik.org/docs/analytics-api/reference/#SitesManager
http://piwik.org/docs/analytics-api/calling-techniques/
http://dev.piwik.org/trac
http://www.youtube.com/user/PiwikAnalytics

http://www.statstory.com/some-reasons-to-choose-piwik-analytics-over-google-analytics/
http://stackoverflow.com/questions/9662357/google-analytics-and-piwik-discrepancy

Clicky:
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      http://clicky.com/compare/piwik