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== External links ==
=== Specifications ===
* [http://www.jcp.org/en/jsr/detail?id=12 JDO 1.0 specification]
* [http://www.jcp.org/en/jsr/detail?id=243 JDO 2.0 specification]
* [http://db.apache.org/jdo/specifications.html JDO 2.1 specification]
* [http://db.apache.org/jdo/specifications.html JDO 2.2 specification]
=== Implementations ===
==== Open Source ====
* [http://www.datanucleus.org/ DataNucleus Access Platform] – Persistence to RDBMS, db4o, LDAP, XML, Excel, NeoDatis, JSON, OpenDocumentFormat, BigTable, Cassandra, MongoDB, Amazon S3
* [http://sourceforge.net/projects/orient Orient Technologies] – [[ODBMS]] with JDO interface
* [http://sourceforge.net/projects/jdoinstruments JDOinstruments ] – [[ODBMS]] with JDO interface
* [http://speedo.objectweb.org Speedo ] – Open Source JDO 2 implementation ([[Object-relational mapping|ORM]])
* [http://db.apache.org/jdo/ Apache JDO] – focused on building the JDO API and the TCK for compatibility testing of JDO implementations.
==== Commercial ====
* [http://download-llnw.oracle.com/docs/cd/E13189_01/kodo/docs41/ Oracle Kodo]
* [http://www.signsoft.de/signsoft/en/Produkte/intelliBO/ Signsoft intelliBO]
* [http://www.versant.com/en_US/products/objectdatabase/ Versant Object Database]
* [http://www.objectdb.com/object/db/database/overview/ ObjectDB Object Database]
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