University Corporation for Atmospheric Research(UCAR): COSMIC Data Analysis and Archive Center(CDAAC)

European Organisation for the Exploitation of Meteorological Satellites(EUMETSAT): RADIO OCCULATION METEOROLOGY Satellite Application Facility(ROM SAF)

National Aeronautics and Space Administration(NASA): Crustal Dynamics Data Information System (CDDIS)

International GNSS Service(IGS): GPS Satellite Ephemerides (Orbits)/Satellite & Station Clocks

National Oceanic and Atmospheric Administration(NOAA): STAR COSMIC tutorial