The core O/RM functionality as provided by Hibernate
Spring Object/Relational Mapping
Aggregator of the Hibernate Core modules.
The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.
JPOX is a heterogenous Java persistence solution. It implements the JDO1, JDO2 and JPA1 specifications of Java persistence.
ObJectRelationalBridge (OJB) is an Object/Relational mapping tool that allows transparent persistence for Java Objects against relational databases.
Lightweight Object Relational Model (ORM) for persisting objects to SQL databases.
Lightweight Object Relational Model (ORM) Android classes
Lightweight Object Relational Model (ORM) JDBC classes