MySQL Workbench is a unified visual tool for database architects, developers, and DBAs. MySQL Workbench provides data modeling, SQL development, and comprehensive administration tools for server configuration, user administration, and much more.
phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables, delete/edit/add fields, execute any SQL statement, manage keys on fields.
pgModeler - PostgreSQL Database Modeler - is an open-source data modeling tool designed for PostgreSQL. No more typing DDL commands. Let pgModeler do the work for you! This software unites the concepts of entity-relationship diagrams and the features that PostgreSQL implements...
See your database in a new way. SeeQL is an easy-to-use desktop application that helps you visualize your database tables (including all foreign and primary key relationships), to quickly generate complex queries.