> What do you think is the best way to access to Firebird from
>Delphi? Many developers prefer dbExpress because it is so fast

IBX is a good option because it works in Windows and Linux, there is
already a fork to support Firebird, but IBX still work well with
Firebird.

Zeos Library (http://zeoslib.sourceforge.net) is attractive: thin,
integrated, opensource and supporting a wide range of database
servers. I didn't test it in depth but I integrated it in Report
Manager (http://reportman.sourceforge.net) and seems to work well.