GeoServer - The reference implementation of the Open Geospatial Consortiums WFS and WMS services, GeoServer is...
Mapserver - MapServer is an Open Source platform for publishing spatial data and interactive mapping...
QGIS - QGIS is a desktop geographic information system, or GIS.
Mapnik - Mapnik is a Free Toolkit for developing mapping applications.
what3words - Geocoding system for the simple communication of locations with a resolution of 3 m
ArcGIS - ArcGIS software is a data analysis, cloud-based mapping platform that allows users to customize maps and see real-time data ranging from logistics support to overall mapping analysis.