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A semantic reasoner, reasoning engine, rules engine, or simply a reasoner, is a piece of software able to infer "logical consequences from a set of asserted facts or "axioms. The notion of a semantic reasoner generalizes that of an "inference engine, by providing a richer set of mechanisms to work with. The "inference rules are commonly specified by means of an "ontology language, and often a "description logic language. Many reasoners use "first-order predicate logic to perform reasoning; "inference commonly proceeds by "forward chaining and "backward chaining. There are also examples of probabilistic reasoners, including Pei Wang's non-axiomatic reasoning system, and "probabilistic logic networks.
List of semantic reasoners
Existing semantic reasoners and related software:
- Bossam (software), an RETE-based rule engine with native supports for reasoning over "OWL ontologies, SWRL rules, and RuleML rules.
- OntoBroker is an inference engine with native reasoning over F-Logic, ObjectLogic, RIF, and "OWL. (, W3C-listed inference engine)
Free to use (Closed Source)
- "Cyc inference engine, a forward and backward chaining inference engine with numerous specialized modules for high-order logic. ( ResearchCyc) ( OpenCyc)
- "KAON2 is an infrastructure for managing "OWL-DL, "SWRL, and "F-Logic ontologies.
- Internet Business Logic (software)—A reasoner designed for end-user app authors. Automatically generates and runs complex networked SQL queries. Explains the results in English at the end-user level.
Free software (open source)
- "Cwm, a forward-chaining reasoner used for querying, checking, transforming and filtering information. Its core language is RDF, extended to include rules, and it uses RDF/XML or N3 serializations as required. (CWM, W3C software license)
- "Drools, a forward-chaining inference-based rules engine which uses an enhanced implementation of the "Rete algorithm. (Drools, Apache license 2.0)
- FaCT++ Reasoner, a tableaux-based reasoner for expressive Description Logics (DL), covering OWL and OWL 2 but lacking support for key constraints and some datatypes. Written in C++. (LGPL)
- "Flora-2, an object-oriented, rule-based knowledge-representation and reasoning system. (Flora-2, Apache 2.0)
- Gandalf, open-source decision rules engine on PHP (GPL).
- "Prova, a semantic-web rule engine which supports data integration via SPARQL queries and type systems (RDFS, OWL ontologies as type system). (Prova, GNU GPL v2, commercial option available)
- Pellet, OWL 2 DL reasoner (AGPL, commercial option available)
- HermiT, OWL 2 DL reasoner (LGPL)
- ELK, OWL 2 EL reasoner (Apache 2)
- CEL, OWL 2 EL reasoner (Apache 2)
- jcel, OWL 2 EL reasoner (LGPL / Apache 2)
- RACER, OWL 2 DL reasoner (BSD-3)
- "Jena (framework), an open-source semantic-web framework for Java which includes a number of different semantic-reasoning modules. (Apache Jena, Apache License 2.0)
- RDFSharp, an open source semantic web framework for .NET which includes a semantic extension implementing RDFS/OWL-DL/custom rule-based reasoning. (RDFSharp, Apache License 2.0)
Applications that contain reasoners
- SemanticMiner includes the OntoBroker reasoner to perform ontology-based semantic search. 
- SemanticGuide is an OntoBroker based expert system. 
- "Apache Marmotta includes a rule-based reasoner in its KiWi "triple store.
- dot15926 Editor—Ontology management framework initially designed for engineering ontology standard "ISO 15926. Allows "Python rule scripting and pattern-based data analysis. Supports extensions.
- OWL 2 Reasoners listed on W3C SW Working Group homepage
- SPARQL Query Language for RDF
- Introduction to Description Logics DL course by Enrico Franconi, Faculty of Computer Science, "Free University of Bolzano, Italy
- Inference using OWL 2.0 Semantics by Craig Trim (IBM).
- Marko Luther, Thorsten Liebig, Sebastian Böhm, Olaf Noppens: Who the Heck Is the Father of Bob?. ESWC 2009: 66-80
- Jurgen Bock, Peter Haase, Qiu Ji, Raphael Volz. Benchmarking OWL Reasoners. In ARea2008 - Workshop on Advancing Reasoning on the Web: Scalability and Commonsense (June 2008)
- Tom Gardiner, Ian Horrocks, Dmitry Tsarkov. Automated Benchmarking of Description Logic Reasoners. Description Logics Workshop 2006
- OpenRuleBench Senlin Liang, Paul Fodor, Hui Wan, Michael Kifer. OpenRuleBench: An Analysis of the Performance of Rule Engines. 2009. Latest benchmarks at OpenRuleBench website.