1)   Database Comparer VCL 2.2
Database Comparer helps to compare, synchronize and update databases structure. You can compare one database with anotherdatabase or database with DDL/SQL script or even two DDL/SQL scripts!
synchronize, compare, update database, DDL, script, metadata, SQL, Interbase, Firebird, IB,

 2)   Devrace FIBPlus for Borland InterBase and Firebird 6.5
The simplest and most flexible suite of direct access components to InterBase and Firebird. Supports SQLDialect 3 of InterBase 6.x, array and blob fields, implements local filtering and local sorting in dataset, supports standard data-aware controls.
interbase, firebird, delphi, bcb, sources, db, engine, connectivity, ibo, ibobjects,

 3)   Open QueryBuilder 4.01
Freeware with full source code! The Open QBuilder (OQBuilder) is a simple "visual query builder". You can use OQBuilder in your Delphi and C++Builder applications to make easier SQL-code generation. Supports BDE, ADO, IBO, IBX, DBX, FIBPlus, etc.
BDE, ADO, IBO, IBX, DBX, FIBPlus, SQL, visual, query, database,