libspatialite

the SpatiaLite extension enables SQLite to support spatial data too [aka GEOMETRY], in a way conformant to OpenGis specifications

    * supports standard WKT and WKB formats
    * implements SQL spatial functions such as AsText(), GeomFromText(), Area(), PointN() and alike
    * the complete set of OpenGis functions is supported via GEOS, this comprehending sophisticated spatial analysis functions such as Overlaps(), Touches(), Union(), Buffer() ..
    * supports full Spatial metadata along the OpenGis specifications
    * supports importing and exporting from / to shapefiles
    * supports coordinate reprojection via PROJ.4 and EPSG geodetic parameters dataset
    * supports locale charsets via GNU libiconv
    * implements a true Spatial Index based on the SQLite's RTree extension