Open source ORM systems

Doctrine

Doctrine is a PHP ORM (object relational mapper) for PHP 5.2.3+ that sits on top of a powerful PHP DBAL (database abstraction layer). (GPL)

Cross-platform

greenDAO

greenDAO is an open source Android ORM making development for SQLite databases fun again. It relieves developers from dealing with low-level database requirements while saving development time. (Apache)

Cross-platform

Hibernate

Hibernate is an object-relational mapping (ORM) library for the Java language, providing a framework for mapping an object-oriented domain model to a traditional relational database. (LGPL)

Cross-platform

SQLAlchemy

SQLAlchemy is the Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL. (MIT)

Cross-platform

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