Open Source Database Management Systems (DBMS)

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

ODABA is an terminology-oriented database management system (TODBMS) on a high conceptual level. It provides a number of enhanced features based on natural language analysis. Terminology orientation allows designing user oriented data models. Enhanced event model and Active Data Link technology support rapid development of GUI applications. Several development, documentation, test and analyzing tools are provided in order to support developers and administrators. .NET interface and a powerful object-orjented script language (OSI) improve development efficiency.

Sedna is a free native XML database which provides a full range of core database services - persistent storage, ACID transactions, security, indices, hot backup. Flexible XML processing facilities include W3C XQuery implementation, tight integration of XQuery with full-text search facilities and a node-level update language.

Rel is a DBMS primarily intended for educational purposes, but also suitable as a desktop DBMS or lightweight server, that implements Date and Darwen's "Tutorial D" true relational database language. Source code is available at https://github.com/DaveVoorhis/Rel

Ozone is a fully featured, object-oriented database management system implemented in Java and distributed under the LGPL open source license. The ozone project aims to evolve a database system that allows developers to build pure object-oriented systems.

solidDB for MySQL is an open source relational database management system (RDBMS) that consists of MySQL Server and solidDB Storage Engine for MySQL. Project has morphed into a fully pluggable storage engine for MySQL 5.5 and later. Follow us on Facebook via the SolidDB MySQL Storage Engine page!

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#)

LEAP is an RDBMS (Relational Database Management System) implementing the relational Algebra - a core part of relational database theory. It is primarily used as an educational tool, but has found some novel uses and applications.

MushroomDB is a pure Java multiplatform Relational Database Management System. There are two main goals: to make a fully SQL-92 compliant engine and to provide extensibility mechanisms. A JDBC Driver and a GUI client is supplied with the engine.

myInfoTool is a PHP driven, file based database and database management system. You do not need any SQL server like mySQL. myInfoTool is a god choice for small sites without SQL support. Examples for use: news, guestbooks, FAQ...

DbRevision project aimed to help developers implement automatic upgrade database structure from one reversion to other. DB structure described in independent, XML-based format. All upgrade actions described in XML too.

JSpeed -- Java-based Open-Source Embedded Database Management System supporting network database model with limited relational access. JSpeed's goal is to provide a high-speed embedded database written in 100 percent Java. Key management uses EP-Tree.

A system independent, object-oriented database management system written in PHP. Very fast and small.

WODA is a semi-relational database for beginners to work on data and to learn database basis. With web-based GUI and CLI. Currently in rewrite using Bootstrap for web UI. Built with beginners in mind, it is far easier than any other tool I know, while remaining powerful for advanced users (Perl langage is directly available). Databases can be defined, maintained, added-to, modified, and queried entirely through the web interface without programming. It comes from the 90's and thus is very low in computer resources. Žiga Turk, Woda original author, is also the creator of the famous Virtual Shareware Library (that later evolved into shareware.com) and the former Minister for Education, Science, Culture and Sports in the Government of Slovenia.

A Database Management System which is entirely implemented in Java.

In Memory Database Management System - with SQL and JDBC interface, entirely written in Java