Packages with the geos use flag

dev-db / spatialite : A complete Spatial DBMS in a nutshell built upon sqlite

  • Add the sci-libs/geos library for exact topological tests

sci-geosciences / grass : A free GIS with raster and vector functionality, as well as 3D vizualization

  • Use sci-libs/geos for v.buffer and adds extended options to the v.select module

sci-geosciences / mapserver : Development environment for building spatially enabled webapps

  • Enable sci-libs/geos library support

sci-libs / gdal : Translator library for raster geospatial data formats (includes OGR support)

  • Add support for geometry engine (sci-libs/geos)