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Gaea allows you to view/modify Object Databases with JDO standard. Operations on instances and class structures on the fly. A nigh-complete OQL library is embedded in the project and can easily be used by third-party software to attain OQL compatibility Platforms: Windows, Mac, Linux

Object Mapping Project (OMaP) proposes a way to define and to perform mappings of Java object instances. The objects could be mapped to a XML String, another Java object, database records, Swing screens, etc. And, of course, mapping back is also supported Platforms: Windows, Mac, Linux

JOR is a Java Object Relation mapping tool that is very simple to use. It works with all mayor databases and requires only minimal coding effort. JOR strictly follows the POJO / POJI (Plain Old Java Objects / Plain Old Java Interfaces) model. Platforms: Windows, Mac, Linux

Make java data object persistent in file system whithout database. Between serialization in file and database. Cache your data model in file. Manage more objects than memory can contains Platforms: Windows, Mac, Linux

JavaScript Object Graph for Java is a library designed to simplify working with JSON objects in Java code. Platforms: Windows, Mac, Linux

JDots, Java Dynamic Object Tree Software. A library/framework to create a dynamic tree of Java objects, for active method communication/propagation. Java implementation of the BEAST project. Platforms: Windows, Mac, Linux

[RETIRED] The JMS Distributed Object Framework provides an advanced request/reply framework over JMS, message-driven beans and servlets. Platforms: Windows, Mac, Linux

MOC is an interesting technology that facilitate efficient object oriented programming, exception handling just in C without any additional compiler or preprocessor. The current release contains a scheme interpreter which base on MOC Platforms: Windows, Mac, Linux

This is a Java API binding of the IEEE LTSC LOM (Learning Object Metadata) specification. It defines an implementation neutral Java interface for the LOM, as well as providing a default implementation of that interface, and XML marshalling functionality Platforms: Windows, Mac, Linux

Full featured analogue modeled bass drum synthesizer, written in the object orient real-time music and multimedia environment PD (Pure Data.) Platforms: Windows, Mac, Linux

``Modeling'': an Object-Relational Bridge for python.Make your objects persistent in a RDBMS, just by designing how your classes map to an RDBMS schema, without having to write a single line of SQL! Platforms: Windows, Mac, Linux

The Object-Role Modeling (ORM) standard version 2, associated schemas and generation tools, and a reference implementation in the form of the Natural Object-Role Modeling Architect for Visual Studio (NORMA) product. Platforms: Windows, Mac, Linux

myjson is a small java library that operates with object literals expressed in JSON notation. It can not only convert from java objects to JSON and back, but also compare or even update a java object with the information contained in a JSON string. Platforms: Windows, Mac, Linux

OXmlEd is an easy to use, open source object-XML Mapping library for working with XML on the Java platform.It is based on Dom4jbut it doesnt depend on dom4j. Platforms: Windows, Mac, Linux

Cross platform object oriented stack programming language. This general purpose RPN language works in terminal (running scripts), can be used to develop graphic applications, run as a CGI under web servers or embeded in other applications. Platforms: Windows, Mac, BSD, Linux

oStore is a searchable object cache. Designed as a lightweight system for indexing and storing Java Objects. The result is a searchable database of stored Java objects. Platforms: Windows, Mac, Linux

OVal is an extensible object validation framework for Java 5 or later. Annotations (@NotNull) or XML configuration files can be used to express class constraints. OVal can optionally use AspectJ to enforce automatic validation (DbC) Platforms: Windows, Mac, Linux

PoeMud is an Object Oriented MUD driver designed to work with a MUD library written entirely in Perl. PoeMud's basic socket functionality is provided by the POE module (Perl Object Environment - http://sourceforge.net/projects/poe/). Platforms: Windows, Mac, Linux

DB Object builder is a simple tool which can generate a lot of Java source file for you. Each Java source file map to a table in your database. It is like Hibernate, but it is smaller than it and do not use any complex XML configuration files. Platforms: Windows, Mac, Linux

Simple Object Oriented Language and Compiler (SOOL): using for students taking Compiler Design course Platforms: Windows, Mac, Linux