OSGeo - QGIS is a desktop geographic information system, or GIS.
GRASS GIS - GRASS GIS is a free Geographic Information System (GIS) software used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization.
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.
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.
Felt - Felt lets you create maps collaboratively, using world-class data, and share them in a single click. For team projects or epic adventure with friends.
Mapserver - MapServer is an Open Source platform for publishing spatial data and interactive mapping...