GDAL is an open source MIT licensed translator library for raster and vector geospatial data formats.
OpenOrienteering Mapper is a software for creating maps for the orienteering sport.
Bringing the 3D geospatial ecosystem to Unreal Engine
C++/Python-based 3D geospatial application for simulating and visualizing dynamic objects in planetary environments
R package for spatial data handling https://rspatial.github.io/terra/reference/terra-package.html