Apache Cassandra Cassandra is an open source distributed database management system.
Apache Derby Apache Derby is a relational database management system developed by the Apache Software Foundation that can be embedded in Java programs and used for online transaction processing.
BaseX (database) BaseX is a light-weight open source native XML database management system, developed as a community project on GitHub.
Berkeley DB Berkeley DB (BDB) is a software library that provides a high-performance embedded database for key/value data.
BlackRay BlackRay is an open source main memory high-performance relational database management system developed by SoftMethod GmbH. It is designed to provide high performance for SQL queries and also s...
C-Store C-Store was a database management system based on a column-oriented DBMS developed by a team at Brown University, Brandeis University and the Massachusetts Institute of Technology, including Mi...
Calpont Calpont is a database management software company based in Frisco, TX. Calpont makes InfiniDB, a scalable, software-only columnar database for analytic applications.In April 2011, InfiniDB was ...
cdb (software) cdb, short for "constant database", refers to both a library and data format created by Daniel J. Bernstein.
CouchDB Apache CouchDB, commonly referred to as CouchDB, is an open source database that focuses on ease of use and on being "a database that completely embraces the web".
CSQL CSQL is an open source main memory high-performance relational database management system developed @ sourceforge.net.
CSQL Cache CSQL Cache is an open source high performance, bi-directional updateable data caching infrastructure that sits between the clustered application process and back-end data sources to provide unp...
CUBRID CUBRID is a comprehensive open source relational database management system (RDBMS) highly optimized for Web applications, especially when complex business services process large amount of data ...
Dataphor Dataphor is an open-source truly relational database management system (RDBMS) and its accompanying user interface technologies, which together are designed to provide highly declarative softwar...
Db4o db4o (database for objects) is an embeddable open source object database for Java and .NET developers.
dbm dbm was the first of a family of simple database engines, originally written by Ken Thompson and released by AT&T in 1979.
Drizzle (database server) Drizzle is a free software/open source database management system that was forked from version 6.0 of the MySQL DBMS.
EnterpriseDB EnterpriseDB is a privately held company that provides enterprise class support for PostgreSQL through its products Postgres Plus Solutions Pack, which is PostgreSQL with extra bundled modules.
eXist eXist is an open source database management system entirely built on XML technology, also called a native XML database.
Firebird (database server) Firebird is an open source relational database management system that runs on Linux, Windows, and a variety of Unix platforms.
FlockDB FlockDB is an open source distributed, fault-tolerant graph database for managing data at webscale.
Fyracle Fyracle is a special version of the open source Firebird database which supports Oracle PL/SQL syntax, to ease porting of Oracle applications to open source.
Gadfly (database) Gadfly is a relational database management system written in Python.
GCfilms GCfilms is an application for managing a movie collection, now replaced by GCstar.
GCstar GCstar is an open source application for managing personal collections.
Gizzard (Scala framework) Gizzard is an open source sharding framework to create custom fault-tolerant, distributed databases.
GNOME-DB GNOME-DB is the database application of GNOME Office, the office suite of the GNOME desktop.
GT.M GT.M is a high-throughput key-value database engine optimized for transaction processing.
H-Store H-Store is an experimental database management system designed for online transaction processing applications that is being developed by a team at Brown University, the Massachusetts Institute o...
H2 (DBMS) H2 is a relational database management system written in Java.
Habanero.NET Habanero is an Enterprise Application Framework for the .NET platform that provides tools for rapid application development using agile techniques.
HBase HBase is an open source, non-relational, distributed database modeled after Google's BigTable and is written in Java.
Hibari (database) Hibari is a strongly consistent, highly available, distributed, key-value big data store.
HSQLDB HSQLDB (Hyper Structured Query Language Database) is a relational database management system written in Java.
Hypertable Hypertable is an open source database inspired by publications on the design of Google's BigTable.
Infobright Infobright is a commercial provider of column-oriented relational database software with a strong focus in Machine Generated Data.
Ingres (database) Ingres is a commercially supported, open-source SQL relational database management system intended to support large commercial and government applications.
jGnash jGnash is a free personal finance management application for the Java runtime environment.
Kexi Kexi is an integrated data management application, designed to fill the gap between spreadsheets and database solutions requiring more sophisticated development.
LucidDB LucidDB is an Open Source database purpose-built to power Data Warehouses, OLAP servers and Business Intelligence systems.
Maatkit Maatkit is a toolkit for users, developers, and administrators of MySQL an open-source database.
MariaDB MariaDB is a community-developed branch of the MySQL database, the impetus being the community maintenance of its free status under GPL, as opposed to any uncertainty of MySQL license status und...
Membase Membase (pronunciation: mem-base) is an Open Source (Apache 2.0 license) distributed, key-value database management system optimized for storing data behind interactive web applications.
MemcacheDB MemcacheDB is a persistence enabled variant of memcached, a general-purpose distributed memory caching system often used to speed up dynamic database-driven websites by caching data and objects ...
Metakit Metakit is an embedded database library with a small footprint.
Mnesia Mnesia is a distributed, soft real-time database management system written in the Erlang programming language.
MonetDB MonetDB is an open source column-oriented database management system developed at the Centrum Wiskunde & Informatica (CWI) in the Netherlands.
MongoDB MongoDB (from "humongous") is a cross-platform document-oriented database system.
Mozilla Raindrop Raindrop is a messaging application building on Apache's CouchDB which is used through a web interface.
mSQL-JDBC mSQL-JDBC (aka Soul) is an Open Source Type IV JDBC driver for the mSQL database engine created by George Reese.
MySQL MySQL is a relational database management system that runs as a server providing multi-user access to a number of databases.
Neo4j Neo4j is an open-source graph database, implemented in Java.
NeoDatis ODB NeoDatis ODB is an object database available the GNU Lesser General Public License, hence usable in free or commercial applications.
NoSQL (RDBMS) NoSQL is a shell-based relational database management system that runs under Unix-like operating systems, or others with compatibility layers.
ObjectMapper .NET ObjectMapper .NET is an Object-relational mapping (ORM) solution for the Microsoft .NET platform.
OpenOffice.org Base OpenOffice.org Base ("Base" for short), a database module, initially appeared with OpenOffice.org version 2.0.
OpenQM OpenQM is a Multi-Value (MV) database run-time developed by Ladybridge Systems in the United Kingdom.
OrientDB OrientDB is an open source NoSQL database management system written in Java.
Perst Perst is an open source, dual license, object-oriented embedded database management system (ODBMS), available in two implementations: one that is developed entirely in the Java programming langu...
PostgreSQL PostgreSQL, often simply Postgres, is an object-relational database management system (ORDBMS) available for many platforms including Linux, FreeBSD, Solaris, Microsoft Windows and Mac OS...
Redis (data store) Redis is an open-source, networked, in-memory, persistent, journaled, key-value data store.
Rel (DBMS) Rel is an open source true relational database management system that implements a significant portion of Chris Date and Hugh Darwen's Tutorial D query language.
RRDtool RRDtool aims to handle time-series data like network bandwidth, temperatures, CPU load, etc.
Shapado Shapado is an open source question-answer system written in Ruby, Mongomapper and MongoDB.
SmallSQL The SmallSQL Database is a 100% pure Java DBMS for desktop applications.
Sones GraphDB Sones GraphDB was developed by the company sones in Erfurt and Leipzig.
SQLite SQLite is an ACID-compliant embedded relational database management system contained in a relatively small (~275 kB) C programming library.
Tarantool Tarantool is an open-source NoSQL database and messaging server, developed by Mail.ru.
Tdbengine Tdbengine is a relational database management system with an integrated programming language.
Terrastore Terrastore is a distributed, scalable and consistent document store supporting single-cluster and multi-cluster deployments.
TreapDB TreapDB is a kind of NoSQL data store, and it is based on Treap data structure.
txtSQL txtSQL (pronounced "text-sequel") is an object-oriented (OOP) flat-file database management system written in PHP. Working on ordinary text files with increased file-security, it offers support ...
UnQL UnQL is a specification for a query language for NoSQL databases, developed by the creators of SQLite and CouchDB database management systems, based on SQL used in relational databases with the ...
Virtuoso Universal Server Virtuoso Universal Server is a middleware and database engine hybrid that combines the functionality of a traditional RDBMS, ORDBMS, virtual database, RDF, XML, free-text, web application server...
VoltDB VoltDB is an in-memory database designed by Michael Stonebraker who was involved in Ingres and PostgreSQL. It is an ACID-compliant RDBMS which uses a shared nothing architecture.
Zope Object Database The Zope Object Database (ZODB) is an object-oriented database for transparently and persistently storing Python objects.