Apache OFBiz
Apache OFBiz (Apache Open For Business ) is an open source Enterprise Resource Planning ( ERP) system. OFBiz is a top-level project of the Apache Software Foundation and provides various enterprise applications available. These business applications are modular, using a common data model and form from many business processes of a company.
The entire functionality is based on a common framework, which is realized as a three-tier architecture. For the implementation of the framework, many existing open-source components are used.