- Anatomical Entity Ontology **[AEO](http://www.obofoundry.org/ontology/aeo.html)**
- Agronomy Ontology **[AGRO](https://github.com/AgriculturalSemantics/agro)**
- Apollo Structured Vocabulary **[APOLLO-SV](https://github.com/ApolloDev/apollo-sv)**
- Basic Formal Ontology **[BFO](http://basic-formal-ontology.org/)**
- BRENDA tissue / enzyme source **[BTO](http://www.obofoundry.org/ontology/bto.html)**
- Common Anatomy Reference Ontology **[CARO](https://github.com/obophenotype/caro/)**
- Chemical Entities of Biological Interest **[CHEBI](https://www.ebi.ac.uk/chebi/)**
- Cell Ontology **[CL](https://obophenotype.github.io/cell-ontology/)**
- Human Disease Ontology **[DOID](https://disease-ontology.org/)**
- Drug Ontology **[DRON](https://github.com/ufbmi/dron)**
- Human developmental anatomy ontology **[EHDAA2](http://obofoundry.org/ontology/ehdaa2.html)**
- Environment Ontology **[ENVO](http://environmentontology.org/)**
- Food-Biomarker Ontology **[FOBI](http://www.obofoundry.org/ontology/fobi.html)**
- **[FoodOn](https://foodon.org/)**
- Gazetteer **[GAZ](http://obofoundry.org/ontology/gaz.html)**
- Gene Ontology **[GO](http://geneontology.org/)**
- Human Phenotype Ontology **[HP](http://www.obofoundry.org/ontology/hp.html)**
- Information Artifact Ontology **[IAO](https://github.com/information-artifact-ontology/IAO/)**
- Mammalian Phenotype Ontology **[MP](http://www.informatics.jax.org/vocab/mp_ontology/)**
- NCBI organismal classification **[NCBITaxon](http://obofoundry.org/ontology/ncbitaxon.html)**
- Ontology for Biomedical Investigations **[OBI](http://obi-ontology.org/)**
- Phenotype And Trait Ontology **[PATO](http://obofoundry.org/ontology/pato.html)**
- Population and Community Ontology **[PCO](https://github.com/PopulationAndCommunityOntology/pco)**
- Plant Experimental Conditions Ontology **[PECO](http://www.obofoundry.org/ontology/peco.html)**
- Plant Ontology **[PO](http://www.obofoundry.org/ontology/po.html)**
- Relation Ontology **[RO](https://oborel.github.io/)**
- Symptom Ontology **[SYMP](http://symptomontologywiki.igs.umaryland.edu/)**
- **[Uberon](http://uberon.github.io/)**
- Units of measurement ontology **[UO](https://github.com/bio-ontology-research-group/unit-ontology)**
- Experimental condition ontology **[XCO](https://rgd.mcw.edu/rgdweb/ontology/view.html?acc_id=XCO:0000000)**