The OGR Simple Features Library is a C++ library providing read/write support for a variety of Geospatial (GIS) vector file formats including Shapefiles, Mapinfo MID/MIF and TAB, PostGIS, and Oracle Spatial. It attempts to follow an OpenGIS Simple Features geometry model, and use OpenGIS coordinate system standards. C and Python bindings are provided. It is a component of the GDAL project.
Tkgeomap is a set of extensions to the Tcl/Tk scripting language for accessing, manipulating, and displaying geographic data. The extensions add commands that perform basic cartographic calculations, define and use projections, store data in lines and as named places, and display the data in canvas widgets.
Appomattox is a project to build a set of cross-platform mapping objects for the .NET framework. It is also a desktop GIS application. It currently supports the following data sources: shapefiles, raster data (JPEG, GIF, TIFF, bitmap, and PNG), and PostGIS. The goal of Appomattox is to provide an elegant and intuitive user interface for mapping and Geographic Information Systems (GIS) without sacrificing power and functionality.