http://opendbcopy.sourceforge.net/  This tool is designed for repetitive and scripted DB load/unload for test setup, data migration etc.  Looks like will possibly work to migrate a WLP portal repository from test, qa, production. 
 Eclipse plug in (commercial, very low price):  JFaceDB http://www.pratocity.com/index.jsp 
Squirrel SQL (http://squirrel-sql.sourceforge.net/).   
http://octopus.objectweb.org/ http://cloveretl.berlios.de/ http://www.manageability.org/blog/stuff/open-source-etl/view
   
 
  |