SWEET ontologies are written in the OWL ontology language. OWL is an XML language being adopted as a standard by the W3C. SWEET ontologies can be viewed using a standard browser. More specialized OWL-specific tools are available such as SWOOP or Protege.

SWEET 1.1 ontologies available here.

SWEET 2.0 Beta expanded ontologies available here.
SWEET 2.0 is highly modular with nearly 100 ontologies organized by subject.

See our Planetary Ontologies site for sharing ontologies.