Piwik - piwik.org

Description 
===========	
Piwik is an open source web analytics software. 
It gives interesting reports on your website visitors, your popular pages, 
the search engines keywords they used, the language they speak… and so much more.

Piwik aims to be an open source alternative to Google Analytics.

Mission statement
=================
« To create, as a community, the leading international open source 
  web analytics application, providing access to all functionality 
  through open components and open APIs. » 

License
=======
Piwik is released under the GPL v3 license, see misc/gpl-3.0.txt 

Requirements
============
- php 5.1.3 or greater
- mysql 4.1 or greater, mysqli or PDO library must be enabled
- OS / server independant
See http://piwik.org/docs/requirements/

Install 
=======
- Upload piwik in your webserver 
- Point your browser to the directory
- Follow the steps
- Add the given javascript code to your pages
See http://piwik.org/docs/installation/

Changelog
=========
See http://piwik.org/changelog/

API
===
All the data is available via APIs for example to get todays keywords in XML
?module=API&method=Referers.getKeywords&idSite=1&period=month&date=today&format=xml

or yesterday visits information in JSON
?module=API&method=VisitsSummary.get&idSite=1&period=month&date=yesterday&format=json

Check the full documentation on http://dev.piwik.org/trac/wiki/API/Reference

Generate fake data
==================
You can generate fake data in your Piwik install so you can play with the User Interface and 
get a feel for Piwik. You can go the Plugins page in the admin area, and enable the VisitorGenerator plugin.

Contact
=======
http://piwik.org
hello@piwik.org