Compiere ERP+CRM is the leading open source ERP solution for Distribution, Retail, Manufacturing and Service industries. Compiere automates accounting, supply chain, inventory and sales orders. Compiere ERP is distributed under GPL V2 by Compiere, Inc.
JRPT is a library of JAVA objects and generic JSP files which enables the report creation offering many features at no programming cost. The package contains doc with examples of reports and their implementation in JRPT.