BioPortal: has over 700 biomedical ontologies, including the OBO Foundry ontologies. Users can search for terms or browse individual ontologies. BioPortal also provides tools to aid in increasing ontology interoperability.
Ontology Lookup Service (OLS): lets users search for terms across all ontologies, or individual ontologies, as well as view term hierarchies. OLS also has an API so that ontologies can be browsed programmatically.
Ontobee: Part of the Onto-Animal tool collection. Users can search all available ontologies and browse detailed descriptions of individiual terms. OntoBee is the default server for most OBO Foundry ontology IRIs.
AberOWL: A repository of biological ontologies and access to reasoned versions of those ontologies. Ontolgies can be browsed by term labels or queried by Manchester OWL syntax statements.
OBO Ontology Training: lessons and tutorials aimed at database curators, ontology curators, ontology engineers/developers, and (semantic) software engineers. Includes the OBOOK, a collection of open documentation for biomedical ontology engineering.
Ontology Development Kit (ODK): A toolkit for initializing a new ontology repository. The template includes a structured directory, a Makefile with automated release workflows, continuous integration testing, and full documentation.
ROBOT: A command line tool to automate ontology workflows. It includes commands that can be used manually or integrated in automated processes to develop and release ontologies.
Protégé: An ontology editing environment for OWL ontologies. It allows developers to visualize the ontology hierarchy, add and edit ontology terms, reason over the ontology, and more.
Onto-Animals: Tools to extract external ontology terms, compare ontologies, edit ontology terms, query and visualize ontologies, and more.
VOCOL: An integrated environment for collaborative vocabulary development
Ontofox: An ontology term and relation extraction and reuse tool
Ubergraph: A sparql endpoint with many OBO ontologies loaded and pre-reasoned with simple triples materialized
OBO Dashboard: An assesment of OBO Foundry ontologies’ conformance to OBO Foundry principles
OBO Community Health Report: A self-updating assessment of the quality of metadata, responsiveness of the maintainers, and the overall community engagement for each OBO Foundry ontology.
Ontology Quality Assessment: A self-updating assesment of the semantic quality of OBO Foundry ontologies and beyond (using known prefixes, using standard identifiers, etc.)
OBO Foundry in 2021: operationalizing open data principles to evaluate ontologies(2021). Rebecca Jackson, Nicolas Matentzoglu, James A Overton, Randi Vita, James P Balhoff, Pier Luigi Buttigieg, Seth Carbon, Melanie Courtot, Alexander D Diehl, Damion M Dooley, William D Duncan, Nomi L Harris, Melissa A Haendel, Suzanna E Lewis, Darren A Natale, David Osumi-Sutherland, Alan Ruttenberg, Lynn M Schriml, Barry Smith, Christian J Stoeckert Jr., Nicole A Vasilevsky, Ramona L Walls, Jie Zheng, Christopher J Mungall, Bjoern Peters. Database, Volume 2021, baab069, https://doi.org/10.1093/database/baab069