= 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] * [http://www.mapwindow.org/ MapWindow GIS] (C API) * [http://wiki.openstreetmap.org/wiki/Osm2pgsql osm2pgsql] (C++ API) = Proprietary packages using GEOS = * [http://www.safe.com/ FME] * [http://www.mapguide.com/ Autodesk MapGuide Enterprise]