This document provides information about SCAR-MarBIN and ANTABIF, which are web platforms that provide open access to marine biodiversity data. SCAR-MarBIN was funded by various organizations and aims to build a network of biodiversity data, adopt standards, and make data accessible to science, conservation and management. It contains over 1 million records from 138 datasets covering over 5,200 taxa. ANTABIF is being developed to create a new portal for Antarctic biodiversity data. Both aim to ensure the long-term continuation of sharing biodiversity data networks.