PostGIS

From PostGIS website: PostGIS is a spatial database extender for PostgreSQL object-relational database. It adds support for geographic objects allowing location queries to be run in SQL.
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A list devoted to the discussion of the use and uses of the PostGIS/PostgreSQL spatial database system. 5744 19075
by Bruce Rindahl-2
This list is devoted to discussion of ongoing development to the PostGIS spatial database. Technical issues and debates about changes to the internals of PostGIS belong here. 1942 7209
by Paul Ramsey