GEOS (Geometry Engine - Open Source) is a C++ port of the JTS Topology Suite (JTS). It includes the OpenGIS Simple Features for SQL spatial predicate functions and spatial operators, as well as specific JTS enhanced topology functions.
GEOS is the most widely used geospatial C++ geometry library, being used by open source projects such as PostGIS, QGIS, GDAL/OGR and MapServer, and by proprietary products including FME.
Website: http://geos.osgeo.org/
Licence: LGPL
Software Version: 3.3.2
Supported Platforms: Windows, Linux, Mac
API Interfaces: C, C++
Support: http://lists.osgeo.org/mailman/listinfo/geos-devel, http://www.osgeo.org/search_profile