title: What are the open source tools and techniques to build a complete data warehouse platform?
body: <p>I'm looking for these open source tools possibly free or with free trial version to set up complete data warehouse stack.</p>
  
  <p>I know about few like <a href="http://www.pentaho.com/" rel="noreferrer">Pentaho</a> open source Mondrian server,  but couldn't get any google result to setup complete platform. I'm not sure whether these components are compatible with each other? Could someone please list them along with their position in the chain?</p>