Merging cells:
http://forum.java.sun.com/thread.jspa?threadID=518223&messageID=2474422
http://objectmix.com/java/200334-jtable-merging-cells.html
Charting Libraries:
http://www.jfree.org/jfreechart/
Reporting Libraries
http://www.jfree.org/jfreereport/index.php
Spreadsheet Libraries
http://www.jfree.org/jworkbook/
JExcelApi (Open Source)i
JExcelApi Yahoo Group (Open Source)
How to Add JExcel Library to NetBeans(Open Soource)
JExcel Api (Not the same as above - this one is commercial)
JExcel-PGuide (commercial one)
QuickTable
QuickTable Forum
JDataGrid Spreadsheet Edition
