LiteSQL is a codegenerator and C++ library that integrates C++ objects tightly to relational database and thus provides an object persistence layer. LiteSQL supports SQLite3, PostgreSQL, MySQL and oracle as backends.
Design your ORM application in a platform independent way.
Essential ORM Modeler allows you to model your application using an extension of UML class models, generating code for distinct ORM frameworks (JPA, SQLAlchemy or Ruby´s ActiveRecord). The notation, based on persistence patterns, is platform independent.
This tool is a plugin of eclipse.