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INDIGO services:

• International GNSS Service (IGS)
• International Laser Ranging Service (ILRS)
• International VLBI Service for Geodesy and Astrometry (IVS)
• Crustal Dynamics Data Information System (CDDIS)

IAG related links:

• Global Geodetic Observing System (GGOS)
• International Association of Geodesy (IAG)
• International DORIS Service (IDS)
• International Earth Rotation and Reference Systems Service (IERS)
• International Terrestrial Reference Frame (ITRF)
• International Union of Geodesy and Geophysics (IUGG)

Other links:

• SOPAC's XML for Geodesy project
• NASA Home Page
• GSFC Home Page
• JPL Home Page
• NASA Earth Science Education and Applications Solutions Network (REASoN) Cooperative Agreement Notice (CAN)  
• GPS Seamless Archive Center (GSAC) (UNAVCO)
• American Geophysical Union (AGU)