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Welcome to the OntoPortal Documentation

About us

OntoPortal (formerly known as the NCBO Virtual Appliance or BioPortal Virtual Appliance or NCBO technology) is the community-maintained distribution of the BioPortal software (originally developed by the Stanford Center for Biomedical Informatics Research).

The OntoPortal Alliance is the community that maintains this software. It is a consortium of research and infrastructure teams (and one SME) dedicated to promoting the development of ontology repositories –in science and more– based on the collaboratively developed OntoPortal open-source software.

See OntoPortal Alliance website for examples of ontology repositories running this software.


This documentation is provided freely for any use by the public (formal license citation pending). For License about the OntoPortal software, see each code repositories.


See the section How to configure the documentation, to know about maintaining and contributing to this documentation.

When contributing to this documentation, for significant changes, please first discuss the changes via issue, email, or any other method with the owners of this repository. You can also use pull requests on the corresponding GitHub repository.

OntoPortal support email list:

Read more about becoming a contributor (for the moment, in our BioPortal repository) in our Contributing Guide.

Code of conduct

OntoPortal Alliance is committed to fostering a welcoming community. View our Code of Conduct (to be updated from the BioPortal source).

Background on technology

(to come)

Thank you to the contributors of this documentation!

  • graybeal
  • alexskr
  • syphax-bouazzouni
  • mdorf
  • jonquet
  • dependabot[bot]
  • jvendetti
  • galviset
  • dwinston
  • Bouchemel-Nasreddine
  • xeniacs