Open Source Java Database Engines/Servers for Linux

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)

Make AI-driven decisions using your data, in real-time. At any scale, with unbeatable performance. Vespa is a full-featured text search engine and supports both regular text search and fast approximate vector search (ANN). This makes it easy to create high-performing search applications at any scale, whether you want to use traditional techniques or a modern vector-based approach. You can even combine both approaches efficiently in the same query, something no other engine can do. Recommendation, personalization and targeting involves evaluating recommender models over content items to select the best ones. Vespa lets you build applications which does this online, typically combining fast vector search and filtering with evaluation of machine-learned models over the items. This makes it possible to make recommendations specifically for each user or situation, using completely up to date information.

Moved to https://github.com/DANS-KNAW/dans-dbf-lib.

Attendance Marker Solution is the attendance marking software connected with local-based or server-based MySQL Server Engine. The connectivity and installation is very easy for use.

eXist-db is a native XML database featuring efficient, index-based XQuery processing, extensions for keyword search, XUpdate support, XSLT support, XForms support, REST and tight integration with existing XML development tools. Moved to Github - https://www.github.com/exist-db/exist

ConceptBase.cc is a multi-user deductive and object-oriented database system for metamodeling and method engineering. Includes a graphical client that builds upon the logic-based features of the ConceptBase.cc server. The data model is O-Telos. ConceptBase.cc can represent information at the data level (example data, traces of process executions etc.), the class level (schemas, process definitions etc.), the metaclass level (constructs of modeling languages), the meta-metaclass level (constructs for defining modeling languages), and so forth. ConceptBase.cc is developed by the ConceptBase Team at University of Skövde (HIS). ConceptBase.cc supports Linux, Mac OS X and Windows. ConceptBase.cc is free software distributed under a FreeBSD-style license.

Farrago is an extensible data management framework with a hybrid Java/C++/UML architecture. It is developed as a sub-project of The Eigenbase Project.

Nextobjects is an Integrated Development Tool for Entreprise Applications. It use Turbine Torque for code generation. It is based on the Merise method.

This project contains an component to building JDO applications with Castor (http://castor.exolab.org/). It's allow easy using of mappings with building OQL queries.

A framework for building, deploying and managing well-described REST-ful Web services, including REST-ful Web Services realizations for RSS, XML Topic Maps, Structured Arguments, and Workflow.

The Eigenbase Project is an open-source platform for building advanced data management systems, and is backed by a non-profit organization which designs, develops, and promotes it.

XORM is an extensible object-relational mapping layer for Java applications. It provides interface-based persistence to RDBMSs using the Java Data Objects (JDO) API while allowing developers to focus on the object model, not the physical layer.

e4Graph is a C++ library and a Tcl binding providing persistent, reliable, cross-platform storage for graph like structures. Please visit http://e4graph.sourceforge.net for more info.

2 Java frameworks with transient and persistent object models based on nonstandard approach (less evident but faster development): an object is a set of named fields. 3 non-object libraries simplifying access to tables stored in RDB, text files, etc.

XML schema to specify relational database administration and operations. Uses XML, XSLT stylesheets and Java code to allow applications to use advance features of databases and have complex queries without being tied to a specific relational database.

The Adept Library contains a lightweight Java Object database for stand-alone applications. It is designed for simplicity of use, exposing a simple DTO - no need for copy logic or complex serialisation techniques. It is also a powerful general library.

Ashpool is a lightweight XML Database written in Java. It is designed to query table like XML documents and has a built in JDBC driver. (Saxon Inside)

JCA compliant connectors for the Berkeley Database system.

Bodega is a distributed objects database framework for AJAX, RIA, REST, SOA, and Web Services.

Project MOVED to Codehaus New location is http://esper.codehaus.org The Esper project aims to provide a general-purpose event processing facility in Java for complex event processing of real-time, high throughput data streams.

A unique persistence layer for Java. CODO (Cursor Oriented Data Objects) maps generated Entity interfaces (suitable for DTOs) to a relational database via rendered SQL, reflection and JDBC Cursors where possible - avoiding associations.

CUBRID QA project contains a test-automation tool and many kinds of test cases for CUBRID database.

Cayenne is an object-relational mapping framework written in Java. This Cayenne project at SourceForge is dedicated to hosting a legacy 1.2 release. For up to date releases please visit the new home at Apache. http://cayenne.apache.org

The project has been renamed CrNiCKL (chronicle) and moved to http://crnickl.sourceforge.net. ChronoDB is a data manager written in Java. It supports time series of any type. With its simple and powerful schema subsystem it takes charge of very large heterogeneous data sets. The software consist of an API and a generic implementation layer running on top of an SQL or a NoSQL system. Applications can mix objects from multiple ChronoDB databases.

Cigol (logic, spelled backwards) is a deductive logic solver. It can be embedded inside a parent program or used from the command line. It has absolutely no relationship to Tom Mitchell's book on Machine Learning.