Rules Engines allow your application to process business rules while maintaining the rules themselves outside the source code in manageable and configurable manner. This enable the creation of systems which can be configured to meet the changing needs of evolving busniess.

Delphi Rules Engine Components & Tools by Catalyst Development Corp

LogicGem V3.00.3000

For programmers and analysts, LogicGem proves logic and business rules by finding missing rules, ambiguities, contradictions and redundancies. They are displayed visually and include tools to automatically correct any errors

Delphi Rules Engine Components & Tools by VDE Technologies LLC

RuleLab.Net 1.7.0

RuleLab.Net is a web-based system for implementing the business rules that operate on an application's XML data. Build, test, and deploy your rules using the web browser; integrate them via the forward chaining rules engine component or web service. Create web-based expert systems using the AJAX script and the rules designer. Features include centralized repository, English-like syntax, XML rule format, strong data types, calculation formulas, computational and aggregate functions.