• https://en.wikipedia.org/wiki/Ontology_(information_science)#Upper_ontology
• https://en.wikipedia.org/wiki/Upper_ontology

Aristotle's Categories

• https://en.wikipedia.org/wiki/Categories_(Aristotle)

1. οὐσία Ousia (german) (IMHO Much better than Ousia

Basic formal ontology BFO

• https://en.wikipedia.org/wiki/Basic_formal_ontology
• http://basic-formal-ontology.org/

Boro

• https://en.wikipedia.org/wiki/BORO

Cyc

• https://en.wikipedia.org/wiki/Cyc

DoDAF DM2

• http://dodcio.defense.gov/Library/DoD-Architecture-Framework/dodaf20_ontology1/
• http://dodcio.defense.gov/portals/0/Images/dodaf20/IDEAS-Foundation-Top-Level.gif

DOLCE Descriptive Ontology for Linguistic and Cognitive Engineering

• http://www.loa.istc.cnr.it/old/Papers/DOLCE2.1-FOL.pdf

GFO - General Formal Ontology

• https://en.wikipedia.org/wiki/General_formal_ontology

ISO 15926

• https://en.wikipedia.org/wiki/ISO_15926

PROTo ONtology

• https://ontotext.com/documents/proton/Proton-Ver3.0B.pdf

Onto-Step

• https://www.researchgate.net/publication/319394604_OntoSTEP_OWL-DL_ontology_for_STEP

Sowa

• http://www.jfsowa.com/ontology/toplevel.htm

Sumo Suggested Upper Merged Ontology

• https://en.wikipedia.org/wiki/Suggested_Upper_Merged_Ontology
• http://www.adampease.org/OP/
• http://www.dfki.de/~horacek/Slides-Standard-Upper-Ontology.pdf

Yamato

• http://download.hozo.jp/onto_library/upperOnto.htm

Other

• Research CYC
• High Fleet

Links

• https://www.researchgate.net/publication/220866366_A_Comparison_of_Upper_Ontologies