True Reality (TR) is an open source LGPL Game and Simulation Engine written entirely in Standard C++ and OpenGL. It runs on all Windows platforms and GNU/Linux. OpenSceneGraph is used as its graphics engine, along with many other open source projects for support of various features.
GNU Lesser General Public License v3.0
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Geographic Information System (GIS) Coordinate System #27
Create a tool to convert between GL units and various Geographic Information System (GIS) coordinates on spherical worlds.