Freeware with full source code!
The Open QBuilder (OQBuilder) is a simple "visual query builder". You can use OQBuilder in your Borland Delphi and Borland C++Builder applications to make easier SQL-code generation. OQBuilder allows you to easy work with local and server databases via BDE, ADO, IBO, IBX, DBX, FIBPlus, etc.
All versions of Open QBuilder are available as freeware with full source code and samples.

FIBPlus 6.0 is a library for Delphi, C++ Builder and Kylix developers who need fast direct access to InterBase and FireBird databases. The advantage of FIBPlus is that it supports all Borland InterBase and Firebird features like array-fields, convenient transaction handling, and is 100% compatible with third-party components and report generators. Most importantly, applications based on FIBPlus do not require BDE, ODBC or anything else.

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!Database Comparer supports following servers: InterBase SQL server and it's clones - FireBird and Yaffil (Yaffil teamrecently announced merge with FireBird); SQL Anywhere.

IBXExTrees Library - components for work with InterBase/FireBird/Yaffil databases
with use IBX data access components.

Library contains following visible components:

1. TIBXExTreeView - DBTreeView component.
2. TIBXExTreeList ? DBListView component.
3. TIBXExTreeComboBox ? DBTreeComboBox component.

FastQueryBuilder (FQB) is a visual SQL query builder. You can use FQB in your applications written in Borland Delphi or Borland C++Builder environment for simple SQL generator creation. FQB enables to work with local and client-server databases using BDE. Also there is an opportunity to work also via other components for data access: ADO, IBX, FIBPlus