PostgreSQL (object-relational DBMS)
January 25, 2011
While MySQL surely is the most-used DBMS throughout the internet, there are alternatives, particularly for enterprise environments. One of these is PostgreSQL, a powerful, open source object-relational database system.
PostgreSQL
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. It runs on all major operating systems, including Linux, UNIX, Mac OS X, and Windows.
It is fully ACID compliant (ACID is a set of properties that guarantee database transactions are processed reliably: atomicity, consistency, isolation, durability), has full support for foreign keys, joins, views, triggers, and stored procedures (in multiple languages), plus it includes most ANSI-SQL:2008-standard data types.
It has native programming interfaces for C/C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC, among others, and exceptional documentation.
It is highly scalable both in the sheer quantity of data it can manage and in the number of concurrent users it can accommodate. There are active PostgreSQL systems in production environments that manage in excess of 4 terabytes of data.
PostgreSQL has won praise from its users and industry recognition, including the Linux New Media Award for Best Database System and five time winner of the The Linux Journal Editors’ Choice Award for best DBMS.
Website: http://www.postgresql.org/
Windows packages: http://www.postgresql.org/download/windows
phpPgAdmin 
phpPgAdmin is a web-based administration tool for PostgreSQL (similar to phpMyAdmin for MySQL). It is perfect for PostgreSQL DBAs, newbies and hosting services.
Website: http://phppgadmin.sourceforge.net/
