There are 3 repositories under disease-ontology topic.
:mask: Disease Ontology Semantic and Enrichment analysis
:books: Biomedical knowledge mining using GOSemSim and clusterProfiler
User-friendly extensions to the Disease Ontology
A Bio2BEL package for the Disease Ontology (http://www.disease-ontology.org)
SPARQL queries for the DO-KB SPARQL sandbox and endpoint