Here is a small selection of existing OWL ontologies that you might want to try. An efficient way of detecting other owl ontologies is using Google: http://www.google.com/search?q=filetype:owl+owl. There is also a new Semantic Web search engine called Swoogle.
Download the .owl files and use the "Create New Project..." function
(from existing sources) to load them into Protege-OWL (version 3.1
or above). In most cases, you can directly open the ontologies from
the web - just paste the URL of the .owl file
into the "Create New Project..." dialog.
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