TOra is an open-source multi-platform database management GUI that supports accessing most of the common database platforms in use, including Oracle, MySQL, and Postgres, as well as limited support for any target that can be accessed through Qt's ODBC support. TOra has been built for various Linux distributions, Mac OS X, MS Windows, and UNIX platforms. In addition to regular query and data browsing functionality, it includes several additional tools useful for database administrators and developers – which aims to help the DBA or developer of database application. Features PL/SQL debugger, SQL worksheet with syntax highlighting, DB browser and a comprehensive set of DBA tools.

deltasql is an advanced Schema Version Control. It is like cvs, but for databases. It allows a team to commonly develop a data model on the fly, while the source code is growing. Branches for production schemas / mySQL, postgreSQL and Oracle supported

DBEdit is a database editing tool, written in Java, which is suitable as a front-end GUI for your Oracle, DB2 or MySQL database. DBEdit's core functionalities provide aid to common data editing tasks and reporting, as well as database synchronization.

Kokpit-db is an integrated monitoring, comparison and performance analysis platform for Oracle databases. It can compare and monitor versions 8i, 9i, 10g and 11g. Supports standby databases and ASM instances. GUI and command line interfaces available.

DB Designer Fork is a fork of the fabFORCE DBDesigner 4. DBDesigner is a visual database design system that integrates entity relationship design and database creation. DB Designer Fork generates SQL scripts for Oracle, SQL Server, MySQL and FireBird.

DataWings addresses three functional areas within the broader area of supporting integration testing of code that accesses and modifies data stored in a relational database.

SQL Installer.NET is a toolset which assists in the development, deployment, and maintenance of applications which interface with a relational database management system (RDBMS). It was initially written for Microsoft SQL Server 2005 but has since been adapted to work with other data providers (inc. Oracle and PostGreSQL).

DbLinq is THE LINQ provider that allows to use common databases with an API close to Linq to SQL. It currently supports (by order of appearance): MySQL, Oracle, PostgreSQL, SQLite, Ingres, Firebird... And still SQL Server.

DBSync for Oracle and MySQL is a database synchronization tool
which performs two-way conversion and synchronization from Oracle
databases to MySQL server and from MySQL to Oracle. The tool is
also applicable for MySQL database replication to another MySQL
database and is quite adept at copying a Oracle database to
another Oracle database.

DBConvert for Oracle and MySQL is a database migration tool which
performs two-way conversion from Oracle databases to MySQL server
and from MySQL to Oracle. The tool is also applicable for MySQL
database migration to another MySQL database and is quite adept at
copying a Oracle database to another Oracle database.