PostGIS
From Wikipedia, the free encyclopedia.

PostGIS is a geographic information system software program that adds support for geographic objects to the PostgreSQL object-relational database.

Released under the GNU General Public License.

External Link

http://postgis.refractions.net/

The original article can be found at: http://en.wikipedia.org/wiki/PostGIS.
All text is available under the terms of the GNU Free Documentation License.