ogr2ogr is an open source command line utility popular for converting to and from various vector spatial data formats.
OGR Simple Features Toolkit home page - http://www.gdal.org/ogr/
OGR Utilities page - http://www.gdal.org/ogr_utilities.html
ogr2ogr page - http://www.gdal.org/ogr2ogr.html
ogr2ogr Supported formats page http://www.gdal.org/ogr_formats.html
