The SQL-92 standard

Oracle 【商业数据库】

http://www.oracle.com/

SQL Server 【商业数据库】

http://www.microsoft.com/sqlserver/en/us/default.aspx

MySQL

http://www.mysql.com/
The MySQL database has become the world's most popular open source database because of its high performance, high reliability and ease of use.

Drizzle	http://www.drizzle.org/	Drizzle | A database for the cloud
MariaDB	http://mariadb.org/	MariaDB - An enhanced, drop-in replacement for MySQL
Percona Server	http://www.percona.com/software/percona-server/	Percona Server is an enhanced drop-in replacement for MySQL
OurDelta	http://ourdelta.org/	OurDelta - Enhanced, packaged convenience for MySQL and MariaDB

SEE ALSO: Study_Database_MySQL_Branch

PostgreSQL

http://www.postgresql.org/
PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness.

EnterpriseDB

http://www.enterprisedb.com/
Postgres Plus Enterprise Edition is the best database and tools package in the PostgreSQL ecosystem for enterprise database compatibility, performance, scalability, high availability, monitoring, management, disaster recovery and application development.

SqLite

http://www.sqlite.org/
SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world.

Berkeley DB

http://www.oracle.com/technetwork/products/berkeleydb/overview/index.html
Berkeley DB (BDB) is a software library that provides a high-performance embedded database for key/value data.

H2 Database

http://www.h2database.com/html/main.html
H2 is a relational database management system written in Java. It can be embedded in Java applications or run in the client-server mode.

HSQLDB

http://hsqldb.org/
HSQLDB - 100% Java Database

Apache Derby

http://db.apache.org/derby/
Apache Derby, an Apache DB subproject, is an open source relational database implemented entirely in Java and available under the Apache License, Version 2.0.

Firebird

http://www.firebirdsql.org/
Firebird is a relational database offering many ANSI SQL standard features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers. It has been used in production systems, under a variety of names, since 1981.

neo4j

http://neo4j.org/
Neo4j is a high-performance, NOSQL graph database with all the features of a mature and robust database.

cayley

https://github.com/google/cayley
An open-source graph database.

OpenTSDB

http://opentsdb.net/
OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.

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数据库系统参考

http://db-engines.com/en/ranking

取数据库元数据信息： http://db.apache.org/ddlutils/

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参考资料

[1]. http://cargocultcoder.blogspot.se/2012/12/what-databases-fix.html
[2]. http://www.aqee.net/what-databases-fix/