Ocean Action Hub
Ocean+ Data provides an overview of global marine and coastal datasets of biodiversity importance, including some datasets of regional interest.
This platform captures ocean conservation funding 2009 to present. Specifically designed for funders, NGOs, and anyone interested in understanding philanthropy's role in various ocean initiatives, it can be used to scan the landscape, analyze funder and NGO networks, increase knowledge about ocean funding, and more.
Ocean Data Viewer (UNEP-WCMC) A tool and repository for global marine data, managed and curated by the UN Environment World Conservation Monitoring Centre (UNEP-WCMC). The Ocean Data Viewer allows users to view and download a range of spatial datasets which are useful to inform decisions regarding the conservation of marine and coastal biodiversity. The Ocean Data Manual and Annexes are also available as a supplement to the Data Viewer.
NOAA’s mission is to understand and predict changes in climate, weather, oceans, and coasts, to share that knowledge and information with others, and to conserve and manage coastal and marine ecosystems and resources.
IODE’s purpose is to enhance marine research, exploitation and development, by facilitating the exchange of oceanographic data and information between participating Member States, and by meeting the needs of users for data and information products.
The Sea Around Us is a research initiative at The University of British Columbia (located at the Institute for the Oceans and Fisheries, formerly Fisheries Centre) that assesses the impact of fisheries on the marine ecosystems of the world, and offers mitigating solutions to a range of stakeholders.
The FAO Fisheries and Aquaculture Department provides advice and objective information to Members to help promote responsible aquaculture and fisheries. To fulfil this role, the Department compiles, analyses and disseminates fishery data, structured within data collections.
FishBase is a global biodiversity information system on finfishes. Its initial goal to provide key facts on population dynamics for 200 major commercial species has now grown to having a wide range of information on all species currently known in the world: taxonomy, biology, trophic ecology, life history, and uses, as well as historical data reaching back to 250 years.
The Maritime Knowledge Centre (MKC) provides collections, information resources and services to support the IMO Secretariat, Member States, representatives and delegates. Its specialized collections comprise the archives of official documents and IMO Publications. The MKC also collects resources covering maritime affairs, shipping and other subjects relevant to the work of the Organization.
Abundance profiling of samples originating from spatially distant locations using a taxonomically and functionally annotated reference gene catalog provides the framework for answering the simple, yet central question quantitative metegenomics attempts to address: "Who is doing what and where?"

Set up in 2004 by the United Nations General Assembly, UNWOA is the Regular Process for global reporting and assessment of the state of the marine environment including socioeconomic aspects.

LITTERBASE summarises results from 1,270 scientific studies in understandable global maps and figures and opens scientific knowledge on marine litter to the public.
The Marine Geoscience Data System (MGDS) provides a suite of tools and services for free public access to marine geoscience research data acquired throughout the global oceans and adjoining continental margins. 
The Ocean Health Index (OHI) helps governments measure ocean health so they can sustainably provide essential benefits for humans. OHI independent assessments track ocean health across regions, countries, and states, at the spatial scales where policy and management decisions are made, and facilitate knowledge sharing among managers and decision makers everywhere.