Is there a pivot table component for Delphi that is opensource or freeware?
As far as I know there is no freeware pivot component for Delphi. Look up in Torry.net.
The most known pivot component in delphi is ExpressPivotGrid Suite from Develop Express.
TFX is a free/open source copy of Decision Cube: http://sourceforge.net/projects/fxds