> Which Firebird admin tool has the best diagramming capability? I'm looking
> for something similar to SQL Server diagrams ideally, but better is ok :)
>

Our IB/FB Development Studio has a special module called Database Designer
that supports ER diagramming.
Check http://www.sqlly.com/dbdesigner.en.html for more details.

--
Best regards.
Pavel Kutakov
SQLLY Development
http://www.sqlly.com