OS reporting services

Pentaho

http://www.pentaho.com/products/reporting/

Jasper

http://jasperforge.org/sf/projects/jasperserver

SpagoBI

http://spagobi.eng.it/ecm/faces/public/guest/home/solutions/spagobi

Openi

http://openi.sourceforge.net/

DataVision

http://datavision.sourceforge.net/

OpenReport

http://www.oreports.com/

BIRT

http://www.eclipse.org/birt/phoenix/