Available under licence from the CSIRO's Australian eHealth Research Centre.
(free for use in Australia by registered license-holders with the Australian Digital Health Agency)
SCRUD operations on ValueSet, ConceptMap, CodeSystem, StructureDefinition and Bundle.
Resource-specific operations: $expand, $validate-code, $lookup, $subsumes, $translate, and $closure
Ontoserver instances can syndicate terminology content from an up-stream or to a down-stream instance via its Syndication API.
This makes it almost trivial to deploy and access the latest version of SNOMED CT-AU and other standard terminologies.