USGS:

• USGS Publications Warehouse
• USGS Coastal and Marine Science Center
• USGS Coastal and Marine Geology Program
• USGS National Assessment of Shoreline Change Project
• USGS Digital Shoreline Analysis System
• USGS Woods Hole Coastal and Marine Science Center
• USGS Pacific Coastal & Marine Science Center
• USGS Coastal and Marine Geology Program Internet Map Server

NASA:

• NASA Coastal Service Center
• NASA Earth Sciences Portal

NOAA:

• NOAA Coastal Services Center
• NOAA Digital Coast
• NOAA National Hurricane Center
• NOAA Shoreline Website
• NOAA Shoreline Data Explorer

USACE:

• USACE eCoastal
• USACE Environmental Laboratory

Texas:

• Texas General Land Office
• Texas Natural Resources Information System (TNRIS)
• TX_UTM Zones Map

Others:

• California Coastline
• GulfBase.org
• Gulf of Mexico Foundation
• Coastal Engineering Manual
• Beachpedia
• Beachpedia blog