MySQL is the world's most popular open source multithreaded, multi-user relational database management system.  The basic program runs as a server providing multiuser access to a number of databases. for accessing MySQL databases are available in all major programming languages with language-specific APIs. In addition, an ODBC interface called MyODBC allows additional programming languages that support the ODBC interface to communicate with a MySQL database, such as ASP or ColdFusion. The MySQL server and official libraries are mostly implemented in ANSI C/ANSI C++.

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Fore more information and recent releases see MySQL Home page. Also see  

PostgreSQL is a powerful, open source 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. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows. It is fully ACID compliant, has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple languages). It includes most SQL92 and SQL99 data types, including INTEGER, NUMERIC, BOOLEAN, CHAR, VARCHAR, DATE, INTERVAL, and TIMESTAMP. It also supports storage of binary large objects, including pictures, sounds, or video. It has native programming interfaces for C/C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC, among others.


For more information and recent releases see PostgreSQL Homepage

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HeidiSQL is an easy-to-use interface and a "working-horse" for web-developers using the popular MySQL-Database. It allows you to manage and browse your databases and tables from an intuitive interface.

For more information see HeidiSQL Homepage

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The DBI is the standard database interface module for Perl. It defines a set of methods, variables and conventions that provide a consistent database interface independent of the actual database being used.

The DBI module enables your Perl applications to access multiple database types transparently. You can connect toMySQL, MSSQL, Oracle, Informix, Sybase, ODBC etc. withouthaving to know the different underlying interfaces of each.The API defined by DBI will work on all these database typesand many more. 

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For more information see Perl DBI