- text/html
- text/uri-list
- application/json
- application/json-home
- application/hal+json|xml
- application/vnd.siren+json
- application/json;odata=fullmetadata
- application/vnd.amundsen.collection+json
- application/vnd.collection.doc+json
- application/atom+xml
- application/opensearchdescription+xml
- application/vnd.error
- application/api-problem+json
- application/merge-patch+json
plus several other more or less simple formats (simple json serialization, json api, json schema etc.) that are not necessarily very hateoas compliant.
- "ALPS describes the operations (actions) and data elements of a service." (from what is alps)
- ALPS.io homepage and spec
- mailing list / google group
- Introductory slides