The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop MapReduce support.
 
Although there are various excellent ORM frameworks for relational databases, data modeling in NoSQL data stores differ profoundly from their relational cousins. Moreover, data-model agnostic frameworks such as JDO are not sufficient for use cases, where one needs to use the full power of the data models in column stores. Gora fills this gap by giving the user an easy-to-use in-memory data model and persistence for big data framework with data store specific mappings and built in Apache Hadoop support.

The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop MapReduce support.

Apache Gora - Provides persistence to column stores, key value stores, document stores and RDBMS

The Castle ActiveRecord project is an implementation of the ActiveRecord pattern for .NET. The ActiveRecord pattern consists on instance properties representing a record in the database, instance methods acting on that specific record and static methods acting on all records. Castle ActiveRecord is built on top of NHibernate, but its attribute-based mapping free the developer of writing XML for database-to-object mapping, which is needed when using NHibernate directly. With Castle ActiveRecord you won't have to learn NHibernate mapping schema to have a working data access layer in minutes. For most cases you won't need to deal with ISession and ISessionFactory. Castle ActiveRecord was built on top of NHibernate. It offers: 
 <UL>
	<LI>Fast development (it handles the mapping and infers as much as it can so you don't have to dig into documentation or deal with tons of xml files every time something changes on your schema)</LI>
	<LI>Predefined common methods like Create, Update, Save, Delete</LI>
	<LI>Easy to implement method like Find, FindAll, FindByName. (Predefined if you use ActiveRecordBase)</LI>
	<LI>Session and transaction scopes that abstracts the ISession offering a more natural idiom</LI>
 </UL>

The Castle ActiveRecord project is an implementation of the ActiveRecord pattern for .NET. The ActiveRecord pattern consists on instance properties representing a record in the database, instance methods acting on that specific record and static methods acting on all records. Castle ActiveRecord is built on top of NHibernate, but its attribute-based mapping free the developer of writing XML for database-to-object mapping, which is needed when using NHibernate directly.

ActiveRecord - ActiveRecord pattern for .NET

Apache Geode  is distributed, in-memory database for scale-out applications. All data is stored in-memory for low latency. Performance scales linearly as nodes are added. Data is distributed automatically between nodes to optimize performance. Clusters fail-over to other nodes in case of failures, and rebalance remaining resources. Geode servers can be configured to talk memcached protocol. 

Apache Geode - Distributed, In-memory Database for Scale-Out Applications

Norm is a simple way to access a JDBC database, usually in one line of code. It purges your code of the complex mess that is Hibernate, JPA, and ORM. It is an extremely lightweight layer over JDBC. It gets rid of large amounts of boilerplate JDBC code. 

norm - Not Object-Relational Mapping

Cayenne is a Java object relational mapping (ORM) framework. Cayenne seamlessly binds one or more database schemas directly to Java objects, managing atomic commit and rollbacks, SQL generation, joins, sequences, and more. With Cayenne's Remote Object Persistence, those Java objects can even be persisted out to clients via Web Services. 
 
Cayenne supports numerous other features, including caching, a complete object query syntax, relationship pre-fetching, on-demand object and relationship faulting, object inheritance, database auto-detection, and generic persisted objects.

Cayenne is a Java object relational mapping (ORM) framework. Cayenne seamlessly binds one or more database schemas directly to Java objects, managing atomic commit and rollbacks, SQL generation, joins, sequences, and more. With Cayenne's Remote Object Persistence, those Java objects can even be persisted out to clients via Web Services. 

Apache Cayenne - User-friendly Java ORM with tools

Apache OpenJPA is a Java persistence project at The Apache Software Foundation that can be used as a stand-alone POJO persistence layer or integrated into any Java EE compliant container and many other lightweight frameworks, such as Tomcat and Spring. 

Apache OpenJPA - Java Persistence API Implementation

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Apache Gora - Provides persistence to column stores, key value stores, document stores and RDBMS

ActiveRecord - ActiveRecord pattern for .NET

Apache Geode - Distributed, In-memory Database for Scale-Out Applications

norm - Not Object-Relational Mapping

Apache Cayenne - User-friendly Java ORM with tools

Apache OpenJPA - Java Persistence API Implementation

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Apache Gora - Provides persistence to column stores, key value stores, document stores and RDBMS

ActiveRecord - ActiveRecord pattern for .NET

Apache Geode - Distributed, In-memory Database for Scale-Out Applications

norm - Not Object-Relational Mapping

Apache Cayenne - User-friendly Java ORM with tools

Apache OpenJPA - Java Persistence API Implementation

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