Mapnik

"Mapnik is an open source mapping toolkit for desktop- and server-based map rendering, written in C++. Artem Pavlenko, the original developer of Mapnik, set out with the explicit goal of creating beautiful maps by employing the sub-pixel anti-aliasing of the Anti-Grain Geometry (AGG) library. Mapnik now also has a Cairo rendering backend. For handling common software tasks such as memory management, file system access, regular expressions, and XML parsing, Mapnik utilizes the Boost C++ libraries. An XML file can be used to define a collection of mapping objects that determine the appearance of a map, or objects can be constructed programmatically in C++, Python, and Node.js.

A number of data formats are supported in Mapnik using a plugin framework. Current plugins exist that utilize OGR and GDAL to read a range of vector and raster datasets. Mapnik also has custom Shapefile, PostGIS and GeoTIFF readers. More data access plug-ins will be available in the future. There is also an osm2pgsql utility,^[3] that converts OpenStreetMap data into a format that can be loaded into PostgreSQL. Mapnik can then be used to render the OSM data into maps with the appearance the user wants."

https://en.wikipedia.org/wiki/Mapnik

http://mapnik.org/