Top catalogs:
Deltares
- OpenEarth production
- OpenEarth test
- Deltares McData test (password required)
- https://pmr-ncv.deltares.nl/ (password required)http://matroos.deltares.nl/direct/opendap.html
- Matroos
TNO
Netherlands
- 3TU test server/TU Delft library
Europe
USA