Piwik is a downloadable, Free/Libre (GPLv3 licensed) real time web analytics software program. It provides you with detailed reports on your website visitors: the search engines and keywords they used, the language they speak, your popular pages… and so much more.
http://piwik.org
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un twitter open source ?
StatusNet is the world's leading Open Source social software. Its OnDemand and OnPremise options power collaboration for small teams and global corporations. StatusNet is the world's most flexible social software solution. Quickly and easily implemented, StatusNet is an open, robust and extensible platform capable of evolving with your needs.
http://status.net/about
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55 Open Source Replacements for Popular Networking Tools
Setting up and maintaining networks used to be something that only "super-geeks" did. Network engineers and administrators at large enterprises usually have a lot of in-depth technical knowledge about how systems work and how they communicate with each other. But these days, lots of people have small networks at their homes and small businesses. They usually don't have the same sort of specialized knowledge, but they still need to be able to set up and troubleshoot the inevitable problems
http://itmanagement.earthweb.com/osrc/article.php/3908601
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