Two days ago version 3.0.0 of SQL Explorer was released by Davy Vanherbergen:
Eclipse SQL Explorer is a thin SQL client that allows you to query and browse any JDBC compliant database. It supports plugins with specialized functionality for individual databases (Oracle, DB2 and MySQL) and can be extended to include specialized support for other databases.
The project started as a fork from the original JFaceDb project which has gone commercial and uses some of the core libraries of SQuirreL SQL.
The application is available as a standalone client or as a plugin for Eclipse 3.2.
On the brand new website you can find an overview of the SQL Explorer features, but also a page on how to extend SQL Explorer. So people who want to write extensions, for example to support other databases, are always welcome to join the project.
I’m listed as developer on the Sourceforge project pageSourceforge, but I’m only responsible for testing and packaging the application on MacOSX.