1. Fluent editor (2018).
http://www.cognitum.eu/Semantics/FluentEditor/
2. The neon toolkit (2018).
http://neon-toolkit.org
3. Ontologies (2018).
https://www.w3.org/standards/semanticweb/ontology
4. Owlgred (2018).
http://owlgred.lumii.lv/
5. Protégé (2018).
https://protege.stanford.edu