KSqlAnalyzer is a tool for easy accessing the data of a MS-SQL-Database. The functionality and the look&feel are similar to the program 'SQL-Query-Analyzer' written by Microsoft.
mysqldiff is a Perl script which compares the data structures (i.e. table definitions) of two MySQL databases and returns the differences as a sequence of MySQL commands suitable for piping into mysql which will transform the structure of the first database to be identical to that of the second.
ConceptBase a multi-user deductive object manager mainly intended for conceptual modeling and coordination in design environments. Requieres registration on the page of project.
MaxDB by MySQL is a re-branded and enhanced version of SAP DB, SAP AG's open source database. MaxDB is a heavy-duty, SAP-certified open source database that offers high availability, scalability and a comprehensive feature set. MaxDB complements the MySQL database server, targetted for large mySAP ERP environments and other applications that require maximum enterprise-level database functionality.
The best developer's and/or admin's GUI tool for Sqlite3 in the world. No joking here (or just a bit only) - it contains the most complette feature set of all tools available.
Another PostgreSQL Diff Tool (also known as apgdiff) is free PostgreSQL diff tool that is useful for comparison/diffing of database schemas. The tool compares two database dump files and creates output with DDL statements that can be used to update old database schema to new one or to see in what both databases differ.
Coral is objective of the CORAL project is to develop a robust and efficient deductive database system, and to investigate its use in various application domains.