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WordPress › Blog Tool and Publishing Platform

http://wordpress.org/ WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time. The core software is built by hundreds of community volunteers, and when you’re ready for more there are thousands of plugins and themes available to transform your site into almost anything you can imagine .
http://www.pentaho.com/

Open Source Business Intelligence - Open Source Reporting, ETL &

Better Together: Pentaho tightly couples data integration with business analytics in a modern platform that brings together IT and business users to easily access, visualize and explore all data that impacts business results
http://www.egroupware.org/

EGroupware - Online Groupware, CRM: Home

EGroupware is powered by a team dedicated to provide the support you need as well as by a community of thousands of people around the world.