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)
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