PyDBDesigner is an entity-relation (ERW) database modeling tool for both Windows and Unix/Linux. It is similar to Power Designer or Erwin, and both physical and logical models are supported. Its main features are database modeling, SQL generation, documentation generation, and reverse engineering. PyDBDesigner is intended to be a GUI design tool for the ERW (entities and relations on the Web) project.
BOND is a RAD (rapid application development) tool for creating database applications. It allows you to develop GUI front ends to PostgreSQL databases. It uses XML to define widget layout and how to obtain information from databases.
IBAccess is an Interbase client application to allow users and administrators to perform common tasks with their Interbase databases in a user friendly interface.
sql++ is an easily configurable, feature-rich, portable command-line SQL tool. It can be used with many different databases and in place of other command-line tools such as MySQL's mysql-client and Oracle's sqlplus
mysqlquery is a query tool that passes results through a template. It is well-suited for auto-generating all kinds of things from a database like authentication tables.