Geodetical Models
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Nederlandse Geometrische Infrastructuur (RDNAP)
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European Coordinate Reference Systems (CRS)
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European Vertical Reference System (EVRS)
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US Geological Survey Map Projections
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Wolfram MathWorld Map Projections
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Interactive Album of Map Projections
Wikipedia Encyclopedia
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Wikipedia Map Projection
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Wikipedia Geodetic Datum
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Wikipedia Reference Ellipsoid
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Wikipedia Geoid Surface
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Wikipedia Plate Tectonics
Geodetical Tools
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GPS, UTC, and TAI Clocks
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On-Line Geodesy Resources
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NGS On-Line Geodetic Tool Kit
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Geoscience Australia Geodesy & GNS
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OGC Geography Markup Language (GML)
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ISO 19136 Geography Markup Language (GML)
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ISO/IEC 18026 Spatial Reference Model (SRM)
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Open Source Geospatial Foundation (OSGeo)
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Cartographic Projections Library (PROJ.4)
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Geospatial Data Abstraction Library (GDAL)
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MSP GEOTRANS (Geographic Translator)
Organizations
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International Association of Geodesy (IAG)
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International Terrestrial Reference Frame (ITRF)
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International Earth Rotation Service (IERS)
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International GNSS Service (IGS)
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International Service for the Geoid (ISG)
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International Centre for Global Earth Models (ICGEM)
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International Federation of Surveyors (FIG)
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Open Geospatial Consortium (OGC)
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IOGP Geomatics Committee (EPSG & GIGS)
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US Coast Guard Navigation Information Center
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US National Geospatial-Intelligence Agency
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US NOAA's National Geodetic Survey (NGS)
Navigation Systems
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GPS World - The Almanac
Orbit Data and Resources on Active GNSS Satellites -
Global Navigation Satellite System GPS (U.S. Government)
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Global Navigation Satellite System GLONASS [ГЛОНАСС]
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Global Navigation Satellite System BeiDou (BDS) [ 北斗卫星导航系统 ]
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Global Navigation Satellite System Galileo (GSA)
Galileo (ESA)
Galileo (EC)
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Indian Regional Navigational Satellite System (IRNSS) [भारतीय क्षेत्रीय नौवहन उपग्रह प्रणाली]
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Japanese Regional Quasi-Zenith Satellite System (QZSS) [準天頂]