DITTO hosts six affiliated Ocean Decade Projects: The Caspian Sea Digital Twin (CasSeaDi), Beyond One Ocean Health (B1OH) and Interoperability Architecture for a Digital Ocean (TURTLE), Pilot Digital Twins for Water Pollution in Africa, Haig Fras Marine Protected Area Digital Twin, and A federated Open Research Ecosystem for the oceans (Blue-Cloud2026). These Projects are creating localized Digital Twins and contributing their experiences to the development of an overarching DITTO framework.