A useful resource for finding ontologies is the Ontology Lookup Service (OLS). It includes many of the ontologies that are likely to be useful to behavioural scientists but also many ontologies that are not very well constructed. Ontologies relevant to the behavioural sciences are listed in the NASEM Report.
Many ontologies, including the Behaviour Change Intervention Ontology (BCIO) link up to an 'upper level' ontology called Basic Formal Ontology (BFO). This is a small but very powerful and important ontology that seeks to classify everything in the universe in terms of its most general features. Linking entities in an ontology to BFO means that its entities can be compared with other entities that are linked to BFO maximising 'interoperability'.
The Behavioural and Social Sciences Ontology (BSSO) Foundry is a new resource for people working in behavioural and social sciences that aims to curate ontologies in this domain.
Some commonly used biomedical ontologies that you can browse using OLS are:
HPO - Human Phenotype Ontology
Apart from OLS, another website to find ontologies is Ontobee. This website contains ontologies used in biomedical science that conform to a set of standards set by the OBO Foundry.
