Firebird DTP Plugin
You can find the source in the fbdtp repository on GitHub.
This plugin is a work-in-progress, bug reports can be posted on GitHub, or on the Firebird-Java mailinglist (see Firebird Lists and Newsgroups for details).
For now the basic plugin will be available for download here. Although the plugin follows the org.eclipse.* naming-convention, it is not (yet) officially condoned by the Eclipse Foundation, and there are still some licensing issues to work out.