PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, PostGIS "spatially enables" the PostgreSQL server, allowing it to be used as a backend spatial database for geographic information systems (GIS), much like ESRIs SDE...

PostGIS is the most popular Windows, Mac & Linux alternative to H2GIS.
PostGIS is the most popular Open Source & free alternative to H2GIS.
- PostGIS is Free and Open Source




