Open Source BI.

They are really baking em as pancakes, i must admit:
Pentaho – http://www.pentaho.org
GreenPlum – http://www.greenplum.com
Jaspersoft – www.jaspersoft.com
Eclipse/BIRT – http://www.eclipse.org/birt/
Jpivot – http://jpivot.sourceforge.net/
The Bee Project – www.bee.insightstrategy.cz/en/index.html
OpenI – www.openi.org
PALO www.palo.net
SQL Summit – www.sqlsummit.com/trends/OpenSourceBI.htm
Breadboard BI – www.breadboardbi.com
Spago BI – http://spagobi.objectweb.org/
Got the list here.