= Free Software packages using GEOS = * [http://www.postgis.org PostGIS] (C API) * [http://mapserver.org/ MapServer] (C API) * [http://www.qgis.org/ Quantum GIS] (C API) * [http://www.gdal.org/ogr/index.html OGR] (C API) * [http://grass.itc.it/ GRASS] (C API) * [http://trac.gispython.org/lab/wiki/Shapely Shapely] (C API) * [http://www.ingres.com/ INGRES] (C API) * [http://www.gaia-gis.it/spatialite/ SpatiaLite] (C API) * [http://www.osgeo.org/mapguide MapGuide Open Source] * [http://geodjango.org/ GeoDjango] (C API) * [http://www.mapwindow.org/ MapWindow GIS] (C API) * [http://wiki.openstreetmap.org/wiki/Osm2pgsql osm2pgsql] (C++ API) * [http://osgearth.org osgEarth] (C++ API) * [http://monetdb.cwi.nl/ MonetDB] (C API) * [http://rgeos.r-forge.r-project.org/ rgeos] (C API) * [http://synthese.rcsmobility.com/ SYNTHESE] (C++ API) * [https://github.com/zoocasa/geos-extensions Zgel] (Ruby API) * [http://www.moovieland.com ML] (Open Source API) = Proprietary packages using GEOS = * [http://www.safe.com/ FME] * [http://www.mapguide.com/ Autodesk MapGuide Enterprise]