I am not sure about the RDBMS for which I has been used. But i am using IBM Informix DB in a project for last 5 years. Since that time, there isn't any tool available for this RDBMS other than DBVisualizer. It is easy, fast, and effective tool.
Back in 1998 when the first lines were written, Oracle was the database it was tested with. The initial purpose was to graphically renderer primary/foreign key mappings (also called referential integrity constraints) in an Oracle database. Soon support was added to run any SQL statement, editing table data and so on. Initially it was a free product and in 2002 we launched the commercial extension, DbVisualizer Personal, with many new features added compared to the free edition. DbVisualizer Free is currently being enhanced in parallel with the commercial DbVisulizer Personal edition but we put the majority of new features in the Personal edition.
We test DbVisualizer with a lot of databases and the community have reported use with even more databases. We do however focus on the biggest vendors and currently there are database specific support for 9 databases; Oracle, DB2 LUW, SQL Server, Sybase ASE, Informix, MySQL, PostgreSQL, Mimer SQL and JavaDB/Derby. This include procedure editing, schema export, import table data, creating, altering and dropping objects, create and alter table plus a lot more.
Check the "Database Specific" section in the users guide for a detailed listing for each database: