Rule Engines

Drools
Drools is an Object-Oriented Rule Engine for Java. Drools is an augmented implementation of Forgys Rete algorithm tailored for the Java augmented implementation of Forgys Rete algorithm tailored for the Java language. Adapting Rete to an object-oriented interface allows for more natural expression of business rules with regards to business objects. More importantly, Drools provides for declarative logic programming and is flexible enough to match the semantics of your problem domain. The various parts that compose a rule may be extended to lend domain-specific sense to the rule.
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SweetRules
SweetRules is a uniquely powerful integrated set of tools for semantic web rules and ontologies, revolving around the RuleML (Rule semantic web rules and ontologies, revolving around the RuleML (Rule Markup/Modeling Language) emerging standard for semantic web rules, and supporting also the closely related SWRL (Semantic Web Rule Language), along with the OWL standard for semantic web ontologies, which in turn use XML and, optionally, RDF. (SWRL rules are essentially an expressive subset of RuleML rules.) SweetRules supports the powerful Situated Courteous Logic Programs extension of RuleML, including prioritized conflict handling and procedural attachments for actions and tests. SweetRules capabilities include semantics-preserving translation and interoperability between a variety of rule and ontology languages (including XSB Prolog, Jess production rules, HP Jena-2, and IBM CommonRules), highly scaleable backward and forward inferencing, and merging of rulebases/ontologies. Procedural attachments can even be WSDL Web Services. SweetRules pluggability and composition capabilities enable new components to be added relatively quickly. Implemented in Java, SweetRules has a compact codebase (~40K lines of code total for several dozen tools). The SweetRules project is an international, multi-institutional effort, originated and coordinated by the SweetRules group at MIT Sloan led by Benjamin Grosof, and its creation was funded largely by the DAML (DARPA Agent Markup Language) research program which co-pioneered the Semantic Web. SWEET (Semantic WEb Enabling Technology) is an overall set of tools that Benjamin Grosofs group (with collaborators) has been developing since 2001. Other components in it include the SweetDeal e-contracting system approach and prototype, and the SweetPH system for business process ontologies drawn from the Process Handbook. Hundreds of users have already downloaded SweetRules, inspired in part by its well-received demonstrations in detailed presentations at the DAML Principal Investigators Meeting and the International Semantic Web Conference tutorial program.

TermWare
TermWare is a rule processing engine intended for embedding into Java applications. TermWare implements terminal systems concept. Main Java applications. TermWare implements terminal systems concept. Main range of applications: * problem-oriented languages (or DSL, from domain-specific) * problem-oriented languages (or DSL, from domain-specific) development. * computer algebra systems. * various formal models analysis and transformation. * software engineering.

Mandarax
Mandarax is an open source java class library for deduction rules. It provides an infrastructure for defining, managing and querying rules. It provides an infrastructure for defining, managing and querying rule bases.

JLisa
JLisa is a powerful framework for building business rules accessible to Java and it is compatible with JSR94 V, the JavaTM Rule accessible to Java and it is compatible with JSR94 V, the JavaTM Rule Engine API

OpenRules
OpenRules is a full-scale open source Business Rules Management Framework. It efficiently uses the power of MS Excel, Eclipse IDE and Framework. It efficiently uses the power of MS Excel, Eclipse IDE and open source Java libraries to create, deploy, execute, and maintain different rule engines with complex business logic controlled by business analysts.

Zilonis
Zilonis provides a Multithreaded Rules Engine platform and a scripting environment for Java based applications. The core of the scripting environment for Java based applications. The core of the Zilonis platform is based on a variation of the forward chainning Rete algorithm described in Rete: A Fast Algorithm for the Many Pattern/ Many Object Pattern Match Problem, Charles L. Forgy, Artificial Intelligence 19(1982), 17-37.). The implementations follows the optimizations and the structure used in the Soar system, and the ones well described in the paper: Production Matching for Large Learning Systems, Robert B. Doorenbos. 1995 Multithreaded Capabilities A nice feature and contribution from Zilonis, is that it is multithreaded. Because of that, it is easy to reuse a set of rules across several concurrent users in a safe way, without creating copies of the rules and the engine, as you would have to do if you were to use other engines.

Hammurapi Rules
Hammurapi Rules is JSR-94 compliant rules engine. With Hammurapi Rules Java developers dont need to learn a new rules language - rules Rules Java developers dont need to learn a new rules language - rules are written in Java. Hammurapi Rules leverages Java language type system and naming conventions to plug rules into its inference engine.

Take
Take (aka Mandarax Compiler) consists of a scripting language that can be used to define derivation rules, and a compiler that creates that can be used to define derivation rules, and a compiler that creates executable Java code and deploys it into running systems. Take is inspired by Mandarax, has a similar API but does not use a separate interpreter inference engine. The deployment process is very similar to how web servers treat server pages. The result is optimized, reflective and easy to maintain code.

JEOPS
JEOPS is a Java based forward chaining RULE ENGINE. This Rule Engine is used to power up the business process by rules in Java Engine is used to power up the business process by rules in Java Application Servers, client applications, and Servlets.

Open Lexicon
Open Lexicon is a business rules and business process management tool that rapidly develops applications for transaction and tool that rapidly develops applications for transaction and process-based applications. It includes a business rules metadata repository, a business rules engine, and a comprehensive web-based UI for managing and testing the busines rules. It also includes process management tools for orchestrating complex interactions within business rules and business objects.

JRuleEngine
JRuleEngine is a java rule engine, based on Java Specification Request 94, release 1.1, i.e. Rules can be loaded by an XML file or by Request 94, release 1.1, i.e. Rules can be loaded by an XML file or by means of JRuleEngine APIs, so rules can be stored externally into a database, too. The distribution consists of a library that can be embedded into a java application, so it can be used in any kind of application (web based or not).
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