Top catalogs:

• THREDDS topcatalog

Deltares

• OpenEarth production
• OpenEarth test
• Deltares McData test (password required)
• https://pmr-ncv.deltares.nl/ (password required)
• Matroos
  • hyrax (password required)
  • thredds (password required)

TNO

• Dinodata

Netherlands

• 3TU/TU Delft library

Europe

• EUMETSAT
• MERSEA
• MyOcean

USA

• USGS east coast
• NOAA NODC
• http://rocky.umeoce.maine.edu:8080/thredds/catalog.html
• http://motherlode.ucar.edu/thredds/catalog.html
• Oak Ridge National Laboratory
• Texas A&M
• Great Lakes Information Network