Does anyone know any opensource software for Business Intelligence?

Here are few of them; Open source commercial products Jaspersoft: Reporting, Dashboards, Data Analysis, and Data Integration Palo (OLAP database): OLAP Server, Worksheet Server and ETL Server Pentaho: Reporting, analysis, dashboard, data mining and workflow capabilities TACTIC: Reporting, analysis, dashboard, data mining and integration, workflow capabilities Open source free products Eclipse BIRT Project RapidMiner SpagoBI R KNIME TACTIC

These are the available open source softwares available, with R being the more popular.1) Eclipse BIRT Project2) RapidMiner3) SpagoBI4) R5) KNIME6) TACTIC Hope this helps.

Pentaho - sorry, didn't use it though.

For Hoteleirs: STR Report or Travel Click Report

SpagoBI is one of the fastest growing with a large number of contributors.
website: http://www.spagoworld.org/xwiki/bin/view/SpagoBI/ source files: http://forge.ow2.org/project/showfiles.php?group_id=204

since nobody's answering I'll make a suggestion: http://www.cs.waikato.ac.nz/ml/weka/downloading.html In my personal opinio a very comprehensive software that allows excellent Business Intelligence analysis.
Hope this fuses the discussion

SpagoBI, i test for a small application by myself and its perfect

Try Qlick view, personal edition is free.

Considering you are referring to BI in the sense of Data mining and KD then...
Weka is great but built on Java...Pentaho is Weka's commercial fork...R is used a lot by academics, as are Python's extensions..
I'm not entirely sure RapidI is opensource though..

Pentaho offers a suite of very powerful tools for BI and it is opensource