A collection of awesome GNSS/RNSS related sources, tools, data, MOOC's course, etc.

• Open Source Software or Tools
• Online Positioning Services
• Data and Products Archives
• GPS
• GLONASS
• Galileo
• BeiDou

• RTKLIB - An open source program for standard and precise positioning.
• GPSTk - A library and suite of applications to the satellite navigation.
• GNSS-SDR - An open source GNSS software defined receiver.
• GPSLogger - A Lightweight GPS Logging Application For Android.
• GPSTest - An open-source Android GNSS/GPS test program.

• CSRS-PPP - Canadian Precise Point Positioning (NRCan).
• APPS - Automatic Precise Positioning Service (JPL).
• GAPS - GNSS Analysis and Positioning Software (UNB).
• OPUS - Online Positioning User Service (NGS).
• AUSPOS - A free online GPS data processing facility (GA).

• CDDIS - NASA's Archive of Space Geodesy Data
• GSSC - ESA's GNSS Science Support Center
• WHU - Wuhan University Data Center
• BKG - Federal Agency for Cartography and Geodesy

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• NavCen - GPS Constellation status

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• GLONASS-IAC - GLONASS Constellation status

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• GSC - Galileo Constellation status

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• CSNO-TARC - BeiDou Constellation status