Get the homepage:
>>> import bioregistry as br
>>> br.get_homepage("hcao")
'https://www.humancellatlas.org'
Get the OWL download link:
>>> import bioregistry as br
>>> br.get_owl_download("hcao")
'http://ontology.data.humancellatlas.org/ontologies/hcao/releases/2023-05-16/hcao.owl'