Open Source Java Database Engines/Servers for BSD

Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language. More information and downloads at https://firebirdsql.org/, issue tracker is https://github.com/FirebirdSQL/firebird/issues

db4o is the world's leading open source object database for Java and .NET. Leverage fast native object persistence, ACID transactions, query-by-example, S.O.D.A object query API, automatic class schema evolution, small size (http://developer.db4o.com)

NeoDatis ODB is a new generation Object Oriented Database. ODB is a real native and transparent persistence layer for Java, .Net, Groovy, Scala and Google Android. ODB is very simple and very fast and comes with a powerful query language.

OpenVista(R) is the open-source version of VistA, an enterprise grade health care information system developed by the U.S. Veterans Affairs and deployed at 1,500 global facilities. OpenVista is a registered trademark of Medsphere Systems Corporation

XSDB XML is to DATA as HTML is to DOCUMENT. Publish and combine data as easily as HTML format and web browsers publish and view documents. Implementations in Python, javascript, java, C#/.NET.

CSDerby is not CloudScape-Derby(for Java) but rather Derby forked/ported to CSharp. Specifically it is intended to be a native c# Embedded DB for the mono/net platform with the ADO.NET API instead of the JDBC API.

DBLX 3.3 is available! DBLX is a multi-user, client-server relational database. DBLX uses standard SQL and has many types of clients, and client API's. DBLX has a REST server to allow direct access from web applications. The design goals of DBLX are to produce a very fast database which can be used with standard ANSI sql. DBLX source code is available in C# and Java. DBLX includes the server component, a command-line client, as well as client APIs. DBLX is well-documented so that you can just get the database, drop it on to your favorite system and start using it immediately. Go to the Discussion section to read the latest on DBLX!

EmGeeGen is a server-client information distribution system, tailored for use with the EmGee role playing system (though the theoretical platform should be useful for a variety of tasks).

Generic Object Oriented Database System Distributed thick-client OODBMS using aspect-oriented approach to build transparent interface to database from OO programming languages (C++, Java, C#)

The JProgress project provides tools for connectivity with Java clients and the Progress database. JProgress provides an n-tier software architecture for database access for executing remote requests over WANs and the Internet.

Model driven code generation can improve coding standards, speed, quality of development and reduce your costs. From my experience generating code from XML using XSLT is one of the best and fastest solutions. This is just the base of the framework presenting the idea, any code template can be implemented upon request. Some sample generators are present for SQL / PLSQL / C# / AnsiC / Java The main target is to generate DTO/BDO/POJO objects based on the database definitions in multiple languages aligning all technologies used by a development team. If you are willing to contribute drop a message.

A fork of the SAP DB version 7.3, 7.4 and client libraries. Client libraries is being maintained in LPGL license model.

The dotSesame project is a C# port of the Sesame project, which is originally written in Java. It is an open source RDF database with support for RDF Schema inferencing and querying. Full documentation of Sesame can be found at http://www.openrdf.org/

Yaffa is an always evolving idea - now new approach for a data repository mixed with some features of object oriented databases with ease of use, no administration in mind and of course it will fit into the actual environment whatever that is.