nice application with firebird support (recently updated )

"DB Copy Plugin is a database copying plugin for the SQuirreL SQL
Client. It makes it possible to copy and paste tables from one session
to another and between different databases and includes primary key
and foreign key constraints for copied tables, and uses Hibernate 3.0
internally to perform database object type mappings. It supports
Firebird ..." and the rest

http://freshmeat.net/projects/dbcopyplugin/

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developer flamerobin.org