Google Analytics is being utilized by many webmasters for traffic and lead analysis. It is not the only useful analytics package around though. If you are looking for a free and open source web analytics app, you should give Piwik a look. Thanks to these Piwik plugins, you can integrate Piwik with WordPress faster:
WP-Piwik: adds Piwik stats to your WordPress dashboard. It also lets you add the tracking code to your website.
Piwik Notifier Bar: this plugin lets you inform your visitors that you are using Piwik for tracking. You may have to use this plugin in certain countries to comply with privacy laws.
You don’t necessarily need any of these plugins to get started with Piwik, but they can save you a bit of time.