OBO: Open Biological Ontologies

From the site: "This site contains ontologies and points to some other efforts within the community. Ideally we see a range of ontologies being designed for biological domains. Some of these will be generic and apply across all organisms and others will be more restricted in scope, for example to specific taxonomic groups."

The site is not simply a compendium of ontologies. It has inclusion criteria which are fairly strict, in order to facilitate interoperation of the multiple ontologies listed.

Of course, its value is dependent upon the maturity of the individual ontologies, which is not evaluated here but look pretty strong. (The status of each ontology is provided in the database.) But based on the maturity of the database, it seems likely to have many useful ontologies.

There are a few ontologies of potential value to the marine community. These are connotea-tagged with mmi-toadd and ontology.