GeographicLib is a small set of C++ classes for converting between geographic, UTM, UPS, MGRS, and geocentric coordinates, for gravity (e.g., EGM2008), geoid, and geomagnetic field (e.g., WMM2010) calculations, and for solving geodesic problems. For documentation, visit https://geographiclib.sf.io
Geodesy based library (geodetic and geocentric functions)
geoStarsLib has functions for dealing with many geodesy-based problems found in positioning, pointing, and surveying situations. It is useful to determine absolute position on the earth, pointing vectors, coordinate transformations, and other functions.
Oceanmaster is a collection of software components to implement IHO ECDIS for pleasure, cruising and racing sailors and mariners. Features include: Charting, AIS, Instrumentation, Wind/Sea route planning, harbors and ports and more.
A reference implementation of the Polish geobotanical grid
This project is a reference, open source implementation of the coordinate conversion algorithms for the Polish geobotanical grid called ATPOL.
The Species Analyst (TSA) is a research project developing standards and software tools for access to the worlds natural history collection and observation databases.