Mapnik is described as 'Free Toolkit for developing mapping applications. Above all Mapnik is about making beautiful maps. It is easily extensible and suitable for both desktop and web development. - C++/Python GIS toolkit'. There are more than 10 alternatives to Mapnik for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is QGIS, which is both free and Open Source. Other great apps like Mapnik are GRASS GIS (Free, Open Source), GeoServer (Free, Open Source), what3words (Free) and OpenGeo Suite (Free, Open Source).
QGIS, formerly Quantum GIS, is a user friendly open source Geographic Information System (GIS) licensed under the GNU General Public License that runs on Linux, Unix, Mac OSX, and Windows and supports numerous vector, raster, and database formats and functionalities.
GRASS GIS (Geographic Resources Analysis Support System) is an open source, free software (FOSS) Geographical Information System (GIS) with raster, topological, vector, image processing, and visualization functionality.
The reference implementation of the Open Geospatial Consortiums WFS and WMS services, GeoServer is a full featured open source software server written in Java that allows users to query, visualize, combine, edit and publish spatial data over the web.
Maximize the use of your Excel spreadsheet data. Make mapping the easiest. Transform Excel data into visual analysis. We lead in data simplification and presentation. We are committed to deliver the tools needed to outpace competition.
uDig is a GIS software program produced by a community led by Canadian-based consulting company Refractions Research. It is based on the Eclipse platform and features full layered open source GIS. It is written in Java and released under GNU Lesser General Public License.
Spatial Feature Server by MapET is an ESRI Geoservices REST Implementation and works with all ESRI Rest API's. The source of published data is the spatial extension of the major RDBMS, such Oracle, Microsoft SQLServer, MySQL, PostgreSQL.