GPS

• Differential GPS
• Real Time Kinematic (RTK) Positioning
• Awesome GPS visualization
• Awesome location
• Existing GPS algorithms and source code available

GNSS

• Awesome GNSS
• Awesome GNSS
• GAMP: An open-source software of multi-GNSS precise point positioning using undifferenced and uncombined observations

RTK

• RTKLIB
• RTKLIB on GitHub
• RTKLIB on OpenStreetMap
• simpleRTK2B
• ArduSimple store
• RTK Explorer
• Evaluation of Low-Cost, Centimeter-Level Accuracy OEM GNSS Receivers

GPS Trackers

• Balena Fin GPS Tracker

GPS web applications

• OpenHAB GPSTracker Binding
• Followmee
• Gurtam