ELK is an ontology reasoner developed as part of the ConDOR project. The goal of ELK is to fully support the OWL 2 EL profile.
ELK is open-source and released under Apache License 2.0. All components and source code is available from the ELK Google Code Project.
ELK can be used as a plug-in for the Protégé OWL ontology editor: simply copy elk-protege-x.y.z-SNAPSHOT.jar from the latest ELK release into Protégé's plugin folder.
ELK provides a command-line interface for common reasoning tasks, including classification: simply download elk-reasoner-x.y.z-SNAPSHOT-standalone.jar from the latest ELK release.
Yevgeny Kazakov, Markus Krötzsch and František Simančíc.
UK Engineering and Physical Sciences Research Council