JFact is an OWL DL reasoner, based on FaCT++

Artifacts using JFact (19)
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Vitro Dependencies
Last Release on Dec 21, 2025
tawny-owl enables building OWL ontologies in a programmatic environment.
Last Release on May 8, 2026
Whelk reasoner core
Last Release on Nov 2, 2024
ROBOT is an OBO Tool: A library and command-line tool for working with OWL ontologies, especially Open Biological and Biomedical Ontologes (OBO).
Last Release on Oct 2, 2026
A light-weight wrapper for the OWLAPI enabling rapid and concise development of OWL ontologies using Manchester OWL Syntax.
Last Release on Jan 17, 2026
OWL2Query OWLAPI Adapter
Last Release on Nov 30, 2023
Whelk reasoner OWL API bindings
Last Release on Sep 29, 2024
tawny-owl enables building OWL ontologies in a programmatic environment. Fork from the original uk.org.russet/tawny-owl
Last Release on Apr 18, 2026
BUNDLE is a reasoner for probabilistic description logics.
Last Release on Sep 19, 2024
OWLTools Core
Last Release on Feb 3, 2015