Service applications provide a set of RESTful or other Web Services for data access, business logic, third-party integrations, utilities, and any other type of reusable and remotely accessible functionality.
Currency Services - Contains the table and data records for currencies (ISO4217) - code, entiry, name, numeric, minor unit - iso.org
Country Services - Contains the RESTful services and simple web based user interface for countries (ISO3166) - name, codes A2, A3, numeric - opengeocode.org
Airports Services - Contains the RESTful services and simple web based user interface about airports - name, codes, coordinates, etc. available at openflights.org