| ABCD: Access to Biological Data Collections | A metadata standard for the exchange of biological collections and observations | | |
| ACT Sensors List | List of sensors developed by the Alliance for Coastal Technologies | | |
| Agency Portals | Agency portals which enable discovery and download of marine geoscience metadata and data. | | |
| AGU Index Terms | Thesaurus for indexing AGU journal articles and meeting abstracts, covering earth science concepts | | |
| Alexandria Digital Library (ADL) Gazetteer | Gazetteer services provided by Alexandria Digital Library from Map and Imagery Lab, Davidson Library, University of California, Santa Barbara (UCSB). | | |
| All Ontologies hosted at MMI | Coming soon: List of all the ontologies hosted at MMI | | |
| All References at MMI | All MMI metadata references | | |
| Amazon Web Services (AWS) | REST-based Web Services to search Amazon product data. | | |
| Animal Behavior Ontology | Ontology describing animal behavior. | | |
| Aquatic Sciences and Fisheries Abstracts (ASFA) | Aquatic Sciences and Fisheries Abstracts (ASFA) is a paid service providing references to international literative covering marine environments. | | |
| Arctic Observing Network Data Questionnaire | Summary results of the AON data questionnaire (link to details provided). | | |
| Argo Instrument List | Instrument code list from Argo | | |
| Argo Parameters and quality control code lists | List of parameter and quality control codes from Argo | | |
| Auxiliary Description of Instruments | This is a project under development in GCMD to allow instrument metadata in GCMD data submissions that use the Directory Interchange Format. | | |
| Axis | Axis is an open-source implementation of SOAP; part of the Apache Web Services project. | | |
| BIDM | Basic Interoperability Data Model (BIDM) is a IEEE standard (1420.1) for interoperable software cataloging on the Internet; it defines the minimal set of information about assets that reuse libraries should be able to exchange to support interoperability. | | |
| Biodiversity Resource Information Ontology | An ontology describing resources important in biodiversity information management. | | |
| BioPortal 2.0 | | | |
| BODC (British Oceanographic Data Centre) Units | The BODC units table, consisting of all the units codes used in BODC parameter lists. | | |
| BODC Instruments List | List of instruments used by the British Oceanographic Data Centre | | |
| BODC Parameter Ontology Project | The British Oceanographic Data Centre is creating an ontology to link the BODC Parameter Discovery Vocabulary, the CF Standard Names and the GCMD Science Keywords | | |
| BOG CTD Bottle Data Field Names | MBARI's Biological Ocean Group (BOG) CTD Bottle Data Field Names | | |
| BOG CTD Profiling Data Field Names | MBARI's Biological Ocean Group (BOG) CTD Profiling Data Field Names | | |
| British Oceanographic Data Centre Parameter Discovery Vocabulary | The BODC Parameter Dictionary has been completely overhauled during 2004 and now consists of an integrated data markup and parameter discovery vocabularies. | | |
| British Oceanographic Data Centre Parameter Usage Vocabulary | The BODC Parameter Usage Vocabulary may be used as a tool to label a measurement with information on what it is and how it was obtained or to describe parameters (phenomena in GML terminology) in 'use' metadata. | | |
