This deliverable reports on the services that were developed for CORBEL to support access to ontologies and ontology mapping services. The service development has been driven by requirements from BMS ESFRIs in WP3 and 4 and international engagement. Tasks have included: Developing a repository of biomedical ontologies that supports web based and API based access and visualisation of ontologies. This was undertaken within OLS, a recognised ‘Recommended Interoperability Resource’ in ELIXIR Extending and improving the Zooma repository of data to ontology mappings that can be used to predict ontology mappings based on prior curation knowledge Developing a new ontology cross-referencing service that allows users to map between ontologies and medical vocabularies from the UMLS Extending the BioBankUniverse service for granular cross biobank variable matching Development and refinement of tools to support the construction of new ontologies and application specific ontology views by domain experts that is being adopted by projects outside of CORBEL Improving APIs, query Interfaces and services comprising semantic infrastructure based on expert and user feedback from CORBEL partners and international users