Firebird is the perfect database for developing a small program or a large enterprise information system.
MySQL is a successful open source database used in most web applications, e-commerce and online transaction processing.
phpMyAdmin is one of the most known software tools for the MySQL database administration.
PostgreSQL is a good choice when it comes to object-relational database management system, being one of the strongest competitors for Microsoft SQL Server, Firebird, Oracle, Sybase.
SQL Server Express is the solution offered by Microsoft for the development of Windows and Web applications using SQL Server.
Microsoft SQL Server Management Studio Express allows to easily manage SQL Server Express Edition and SQL Server 2005 Express Edition with Advanced Services.